Revert of Remove unused (by clients) SkUnitMapper (https://codereview.chromium.org/283273002/) (https://codereview.chromium.org/288343009/)

Reason for revert:
required blink change failed to land

Original issue's description:
> Remove unused (by clients) SkUnitMapper (https://codereview.chromium.org/283273002/)
>
> This reverts commit dd50c83b5b34dab3a077741861b50ed1f2bc6b8f.
>
> BUG=skia:
>
> Committed: http://code.google.com/p/skia/source/detail?r=14830

R=scroggo@google.com, reed@google.com
TBR=reed@google.com, scroggo@google.com
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Author: reed@chromium.org

Review URL: https://codereview.chromium.org/296823008

git-svn-id: http://skia.googlecode.com/svn/trunk@14838 2bbb7eff-a529-9590-31e7-b0007b416f81

15 files changed, 192 insertions, 101 deletions

diff --git a/gm/alphagradients.cpp b/gm/alphagradients.cpp
index d10828867d..e63fbc9f47 100644
--- a/gm/alphagradients.cpp
+++ b/gm/alphagradients.cpp
@@ -29,7 +29,8 @@ protected:
         SkPaint paint;
         uint32_t flags = doPreMul ? SkGradientShader::kInterpolateColorsInPremul_Flag : 0;
         SkShader* s = SkGradientShader::CreateLinear(pts, colors, NULL, 2,
-                                                     SkShader::kClamp_TileMode, flags, NULL);
+                                                     SkShader::kClamp_TileMode,
+                                                     NULL, flags);
         paint.setShader(s)->unref();
         canvas->drawRect(r, paint);
 
diff --git a/gm/colortype.cpp b/gm/colortype.cpp
index 2774f3a5ff..47bc8a9ab7 100644
--- a/gm/colortype.cpp
+++ b/gm/colortype.cpp
@@ -20,7 +20,7 @@ public:
         SkMatrix local;
         local.setRotate(180);
         SkShader* s = SkGradientShader::CreateSweep(0,0, colors, NULL,
-                                                    SK_ARRAY_COUNT(colors), 0, &local);
+                                                    SK_ARRAY_COUNT(colors), NULL, 0, &local);
 
         SkPaint paint;
         paint.setAntiAlias(true);
diff --git a/gm/convexpolyclip.cpp b/gm/convexpolyclip.cpp
index edafea2f97..b76335c856 100644
--- a/gm/convexpolyclip.cpp
+++ b/gm/convexpolyclip.cpp
@@ -46,7 +46,7 @@ static SkBitmap make_bmp(int w, int h) {
                         colors, pos,
                         SK_ARRAY_COUNT(colors),
                         SkShader::kRepeat_TileMode,
-                        0, &mat))->unref();
+                        NULL, 0, &mat))->unref();
         canvas.drawRect(rect, paint);
         rect.inset(wScalar / 8, hScalar / 8);
         mat.preTranslate(6 * wScalar, 6 * hScalar);
diff --git a/gm/drawbitmaprect.cpp b/gm/drawbitmaprect.cpp
index 33a13f0fe9..d9b1434e57 100644
--- a/gm/drawbitmaprect.cpp
+++ b/gm/drawbitmaprect.cpp
@@ -63,7 +63,7 @@ static void makebm(SkBitmap* bm, int w, int h) {
                         colors, pos,
                         SK_ARRAY_COUNT(colors),
                         SkShader::kRepeat_TileMode,
-                        0, &mat))->unref();
+                        NULL, 0, &mat))->unref();
         canvas.drawRect(rect, paint);
         rect.inset(wScalar / 8, hScalar / 8);
         mat.postScale(SK_Scalar1 / 4, SK_Scalar1 / 4);
diff --git a/gm/gradientDirtyLaundry.cpp b/gm/gradientDirtyLaundry.cpp
index baa7471ef2..f7797e718f 100644
--- a/gm/gradientDirtyLaundry.cpp
+++ b/gm/gradientDirtyLaundry.cpp
@@ -35,28 +35,33 @@ static const GradData gGradData[] = {
     //  { 2, gCol2, NULL },
 };
 
-static SkShader* MakeLinear(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
-    return SkGradientShader::CreateLinear(pts, data.fColors, data.fPos, data.fCount, tm);
+static SkShader* MakeLinear(const SkPoint pts[2], const GradData& data,
+                            SkShader::TileMode tm, SkUnitMapper* mapper) {
+    return SkGradientShader::CreateLinear(pts, data.fColors, data.fPos,
+                                          data.fCount, tm, mapper);
 }
 
-static SkShader* MakeRadial(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
+static SkShader* MakeRadial(const SkPoint pts[2], const GradData& data,
+                            SkShader::TileMode tm, SkUnitMapper* mapper) {
     SkPoint center;
     center.set(SkScalarAve(pts[0].fX, pts[1].fX),
                SkScalarAve(pts[0].fY, pts[1].fY));
     return SkGradientShader::CreateRadial(center, center.fX, data.fColors,
-                                          data.fPos, data.fCount, tm);
+                                          data.fPos, data.fCount, tm, mapper);
 }
 
-static SkShader* MakeSweep(const SkPoint pts[2], const GradData& data, SkShader::TileMode) {
+static SkShader* MakeSweep(const SkPoint pts[2], const GradData& data,
+                           SkShader::TileMode, SkUnitMapper* mapper) {
     SkPoint center;
     center.set(SkScalarAve(pts[0].fX, pts[1].fX),
                SkScalarAve(pts[0].fY, pts[1].fY));
-    return SkGradientShader::CreateSweep(center.fX, center.fY, data.fColors, data.fPos, data.fCount);
+    return SkGradientShader::CreateSweep(center.fX, center.fY, data.fColors,
+                                         data.fPos, data.fCount, mapper);
 }
 
 
-typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm);
-
+typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data,
+                               SkShader::TileMode tm, SkUnitMapper* mapper);
 static const GradMaker gGradMakers[] = {
     MakeLinear, MakeRadial, MakeSweep,
 };
@@ -90,7 +95,7 @@ protected:
         for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); i++) {
             canvas->save();
             for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); j++) {
-                SkShader* shader = gGradMakers[j](pts, gGradData[i], tm);
+                SkShader* shader = gGradMakers[j](pts, gGradData[i], tm, NULL);
                 paint.setShader(shader)->unref();
                 canvas->drawRect(r, paint);
                 canvas->translate(0, SkIntToScalar(120));
diff --git a/gm/gradient_matrix.cpp b/gm/gradient_matrix.cpp
index 275acc8868..4f2915ab4d 100644
--- a/gm/gradient_matrix.cpp
+++ b/gm/gradient_matrix.cpp
@@ -63,7 +63,7 @@ static const int IMAGES_X = 4;             // number of images per row
 
 static SkShader* make_linear_gradient(const SkPoint pts[2], const SkMatrix& localMatrix) {
     return SkGradientShader::CreateLinear(pts, gColors, NULL, SK_ARRAY_COUNT(gColors),
-                                          SkShader::kClamp_TileMode, 0, &localMatrix);
+                                          SkShader::kClamp_TileMode, NULL, 0, &localMatrix);
 }
 
 static SkShader* make_radial_gradient(const SkPoint pts[2], const SkMatrix& localMatrix) {
@@ -72,7 +72,7 @@ static SkShader* make_radial_gradient(const SkPoint pts[2], const SkMatrix& loca
                SkScalarAve(pts[0].fY, pts[1].fY));
     float radius = (center - pts[0]).length();
     return SkGradientShader::CreateRadial(center, radius, gColors, NULL, SK_ARRAY_COUNT(gColors),
-                                          SkShader::kClamp_TileMode, 0, &localMatrix);
+                                          SkShader::kClamp_TileMode, NULL, 0, &localMatrix);
 }
 
 static void draw_gradients(SkCanvas* canvas,
diff --git a/gm/gradients.cpp b/gm/gradients.cpp
index 277033b5dd..f5abb07efc 100644
--- a/gm/gradients.cpp
+++ b/gm/gradients.cpp
@@ -40,31 +40,35 @@ static const GradData gGradData[] = {
 };
 
 static SkShader* MakeLinear(const SkPoint pts[2], const GradData& data,
-                            SkShader::TileMode tm, const SkMatrix& localMatrix) {
+                            SkShader::TileMode tm, SkUnitMapper* mapper,
+                            const SkMatrix& localMatrix) {
     return SkGradientShader::CreateLinear(pts, data.fColors, data.fPos,
-                                          data.fCount, tm, 0, &localMatrix);
+                                          data.fCount, tm, mapper, 0, &localMatrix);
 }
 
 static SkShader* MakeRadial(const SkPoint pts[2], const GradData& data,
-                            SkShader::TileMode tm, const SkMatrix& localMatrix) {
+                            SkShader::TileMode tm, SkUnitMapper* mapper,
+                            const SkMatrix& localMatrix) {
     SkPoint center;
     center.set(SkScalarAve(pts[0].fX, pts[1].fX),
                SkScalarAve(pts[0].fY, pts[1].fY));
     return SkGradientShader::CreateRadial(center, center.fX, data.fColors,
-                                          data.fPos, data.fCount, tm, 0, &localMatrix);
+                                          data.fPos, data.fCount, tm, mapper, 0, &localMatrix);
 }
 
 static SkShader* MakeSweep(const SkPoint pts[2], const GradData& data,
-                           SkShader::TileMode, const SkMatrix& localMatrix) {
+                           SkShader::TileMode, SkUnitMapper* mapper,
+                           const SkMatrix& localMatrix) {
     SkPoint center;
     center.set(SkScalarAve(pts[0].fX, pts[1].fX),
                SkScalarAve(pts[0].fY, pts[1].fY));
     return SkGradientShader::CreateSweep(center.fX, center.fY, data.fColors,
-                                         data.fPos, data.fCount, 0, &localMatrix);
+                                         data.fPos, data.fCount, mapper, 0, &localMatrix);
 }
 
 static SkShader* Make2Radial(const SkPoint pts[2], const GradData& data,
-                             SkShader::TileMode tm, const SkMatrix& localMatrix) {
+                             SkShader::TileMode tm, SkUnitMapper* mapper,
+                             const SkMatrix& localMatrix) {
     SkPoint center0, center1;
     center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
                 SkScalarAve(pts[0].fY, pts[1].fY));
@@ -73,12 +77,13 @@ static SkShader* Make2Radial(const SkPoint pts[2], const GradData& data,
     return SkGradientShader::CreateTwoPointRadial(
                                                   center1, (pts[1].fX - pts[0].fX) / 7,
                                                   center0, (pts[1].fX - pts[0].fX) / 2,
-                                                  data.fColors, data.fPos, data.fCount, tm,
+                                                  data.fColors, data.fPos, data.fCount, tm, mapper,
                                                   0, &localMatrix);
 }
 
 static SkShader* Make2Conical(const SkPoint pts[2], const GradData& data,
-                             SkShader::TileMode tm, const SkMatrix& localMatrix) {
+                             SkShader::TileMode tm, SkUnitMapper* mapper,
+                             const SkMatrix& localMatrix) {
     SkPoint center0, center1;
     SkScalar radius0 = SkScalarDiv(pts[1].fX - pts[0].fX, 10);
     SkScalar radius1 = SkScalarDiv(pts[1].fX - pts[0].fX, 3);
@@ -87,11 +92,13 @@ static SkShader* Make2Conical(const SkPoint pts[2], const GradData& data,
     return SkGradientShader::CreateTwoPointConical(center1, radius1,
                                                    center0, radius0,
                                                    data.fColors, data.fPos,
-                                                   data.fCount, tm, 0, &localMatrix);
+                                                   data.fCount, tm, mapper,
+                                                   0, &localMatrix);
 }
 
 typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data,
-                               SkShader::TileMode tm, const SkMatrix& localMatrix);
+                               SkShader::TileMode tm, SkUnitMapper* mapper,
+                               const SkMatrix& localMatrix);
 static const GradMaker gGradMakers[] = {
     MakeLinear, MakeRadial, MakeSweep, Make2Radial, Make2Conical
 };
@@ -137,7 +144,7 @@ protected:
                     scale.postTranslate(25.f, 25.f);
                 }
 
-                SkShader* shader = gGradMakers[j](pts, gGradData[i], tm, scale);
+                SkShader* shader = gGradMakers[j](pts, gGradData[i], tm, NULL, scale);
 
                 paint.setShader(shader);
                 canvas->drawRect(r, paint);
@@ -195,7 +202,7 @@ protected:
                 perspective.setSkewX(SkScalarDiv(SkIntToScalar((unsigned) i+1),
                                      SkIntToScalar(10)));
 
-                SkShader* shader = gGradMakers[j](pts, gGradData[i], tm, perspective);
+                SkShader* shader = gGradMakers[j](pts, gGradData[i], tm, NULL, perspective);
 
                 paint.setShader(shader);
                 canvas->drawRect(r, paint);
@@ -320,7 +327,7 @@ protected:
         SkShader* shader = SkGradientShader::CreateRadial(
             SkPoint(center),
             SkIntToScalar(200), gColors, NULL, 5,
-            SkShader::kClamp_TileMode);
+            SkShader::kClamp_TileMode, NULL);
         paint.setShader(shader);
         canvas->drawRect(r, paint);
         shader->unref();
@@ -415,17 +422,17 @@ protected:
             SkAutoTUnref<SkShader> sweep(
                     SkGradientShader::CreateSweep(cx, cy, sweep_colors,
                                                   NULL, SK_ARRAY_COUNT(sweep_colors),
-                                                  flags[i], NULL));
+                                                  NULL, flags[i]));
             SkAutoTUnref<SkShader> radial1(
                     SkGradientShader::CreateRadial(center, radius, colors1,
                                                    NULL, SK_ARRAY_COUNT(colors1),
                                                    SkShader::kClamp_TileMode,
-                                                   flags[i], NULL));
+                                                   NULL, flags[i]));
             SkAutoTUnref<SkShader> radial2(
                     SkGradientShader::CreateRadial(center, radius, colors2,
                                                    NULL, SK_ARRAY_COUNT(colors2),
                                                    SkShader::kClamp_TileMode,
-                                                   flags[i], NULL));
+                                                   NULL, flags[i]));
             paint1.setShader(sweep);
             paint2.setShader(radial1);
             paint3.setShader(radial2);
diff --git a/gm/gradients_2pt_conical.cpp b/gm/gradients_2pt_conical.cpp
index 27f0da186d..dece66ed8b 100644
--- a/gm/gradients_2pt_conical.cpp
+++ b/gm/gradients_2pt_conical.cpp
@@ -1,10 +1,10 @@
+
 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
-
 #include "gm.h"
 #include "SkGradientShader.h"
 
@@ -38,7 +38,8 @@ static const GradData gGradData[] = {
 };
 
 static SkShader* Make2ConicalOutside(const SkPoint pts[2], const GradData& data,
-                                     SkShader::TileMode tm, const SkMatrix& localMatrix) {
+                             SkShader::TileMode tm, SkUnitMapper* mapper,
+                             const SkMatrix& localMatrix) {
     SkPoint center0, center1;
     SkScalar radius0 = SkScalarDiv(pts[1].fX - pts[0].fX, 10);
     SkScalar radius1 = SkScalarDiv(pts[1].fX - pts[0].fX, 3);
@@ -47,11 +48,13 @@ static SkShader* Make2ConicalOutside(const SkPoint pts[2], const GradData& data,
     return SkGradientShader::CreateTwoPointConical(center0, radius0,
                                                    center1, radius1,
                                                    data.fColors, data.fPos,
-                                                   data.fCount, tm, 0, &localMatrix);
+                                                   data.fCount, tm, mapper,
+                                                   0, &localMatrix);
 }
 
 static SkShader* Make2ConicalOutsideFlip(const SkPoint pts[2], const GradData& data,
-                             SkShader::TileMode tm, const SkMatrix& localMatrix) {
+                             SkShader::TileMode tm, SkUnitMapper* mapper,
+                             const SkMatrix& localMatrix) {
     SkPoint center0, center1;
     SkScalar radius0 = SkScalarDiv(pts[1].fX - pts[0].fX, 10);
     SkScalar radius1 = SkScalarDiv(pts[1].fX - pts[0].fX, 3);
@@ -60,11 +63,13 @@ static SkShader* Make2ConicalOutsideFlip(const SkPoint pts[2], const GradData& d
     return SkGradientShader::CreateTwoPointConical(center1, radius1,
                                                    center0, radius0,
                                                    data.fColors, data.fPos,
-                                                   data.fCount, tm, 0, &localMatrix);
+                                                   data.fCount, tm, mapper,
+                                                   0, &localMatrix);
 }
 
 static SkShader* Make2ConicalInside(const SkPoint pts[2], const GradData& data,
-                             SkShader::TileMode tm, const SkMatrix& localMatrix) {
+                             SkShader::TileMode tm, SkUnitMapper* mapper,
+                             const SkMatrix& localMatrix) {
     SkPoint center0, center1;
     center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
                 SkScalarAve(pts[0].fY, pts[1].fY));
@@ -72,12 +77,13 @@ static SkShader* Make2ConicalInside(const SkPoint pts[2], const GradData& data,
                 SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4));
     return SkGradientShader::CreateTwoPointConical(center1, (pts[1].fX - pts[0].fX) / 7,
                                                    center0, (pts[1].fX - pts[0].fX) / 2,
-                                                   data.fColors, data.fPos, data.fCount, tm,
+                                                   data.fColors, data.fPos, data.fCount, tm, mapper,
                                                    0, &localMatrix);
 }
 
 static SkShader* Make2ConicalInsideFlip(const SkPoint pts[2], const GradData& data,
-                             SkShader::TileMode tm, const SkMatrix& localMatrix) {
+                             SkShader::TileMode tm, SkUnitMapper* mapper,
+                             const SkMatrix& localMatrix) {
     SkPoint center0, center1;
     center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
                 SkScalarAve(pts[0].fY, pts[1].fY));
@@ -85,12 +91,13 @@ static SkShader* Make2ConicalInsideFlip(const SkPoint pts[2], const GradData& da
                 SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4));
     return SkGradientShader::CreateTwoPointConical(center0, (pts[1].fX - pts[0].fX) / 2,
                                                    center1, (pts[1].fX - pts[0].fX) / 7,
-                                                   data.fColors, data.fPos, data.fCount, tm,
+                                                   data.fColors, data.fPos, data.fCount, tm, mapper,
                                                    0, &localMatrix);
 }
 
 static SkShader* Make2ConicalInsideCenter(const SkPoint pts[2], const GradData& data,
-                             SkShader::TileMode tm, const SkMatrix& localMatrix) {
+                             SkShader::TileMode tm, SkUnitMapper* mapper,
+                             const SkMatrix& localMatrix) {
     SkPoint center0, center1;
     center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
                 SkScalarAve(pts[0].fY, pts[1].fY));
@@ -98,12 +105,13 @@ static SkShader* Make2ConicalInsideCenter(const SkPoint pts[2], const GradData&
                 SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4));
     return SkGradientShader::CreateTwoPointConical(center0, (pts[1].fX - pts[0].fX) / 7,
                                                    center0, (pts[1].fX - pts[0].fX) / 2,
-                                                   data.fColors, data.fPos, data.fCount, tm,
+                                                   data.fColors, data.fPos, data.fCount, tm, mapper,
                                                    0, &localMatrix);
 }
 
 static SkShader* Make2ConicalZeroRad(const SkPoint pts[2], const GradData& data,
-                             SkShader::TileMode tm, const SkMatrix& localMatrix) {
+                             SkShader::TileMode tm, SkUnitMapper* mapper,
+                             const SkMatrix& localMatrix) {
     SkPoint center0, center1;
     center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
                 SkScalarAve(pts[0].fY, pts[1].fY));
@@ -111,12 +119,13 @@ static SkShader* Make2ConicalZeroRad(const SkPoint pts[2], const GradData& data,
                 SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4));
     return SkGradientShader::CreateTwoPointConical(center1, 0.f,
                                                    center0, (pts[1].fX - pts[0].fX) / 2,
-                                                   data.fColors, data.fPos, data.fCount, tm,
+                                                   data.fColors, data.fPos, data.fCount, tm, mapper,
                                                    0, &localMatrix);
 }
 
 static SkShader* Make2ConicalZeroRadFlip(const SkPoint pts[2], const GradData& data,
-                             SkShader::TileMode tm, const SkMatrix& localMatrix) {
+                             SkShader::TileMode tm, SkUnitMapper* mapper,
+                             const SkMatrix& localMatrix) {
     SkPoint center0, center1;
     center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
                 SkScalarAve(pts[0].fY, pts[1].fY));
@@ -124,12 +133,13 @@ static SkShader* Make2ConicalZeroRadFlip(const SkPoint pts[2], const GradData& d
                 SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4));
     return SkGradientShader::CreateTwoPointConical(center1, (pts[1].fX - pts[0].fX) / 2,
                                                    center0, 0.f,
-                                                   data.fColors, data.fPos, data.fCount, tm,
+                                                   data.fColors, data.fPos, data.fCount, tm, mapper,
                                                    0, &localMatrix);
 }
 
 static SkShader* Make2ConicalZeroRadCenter(const SkPoint pts[2], const GradData& data,
-                             SkShader::TileMode tm, const SkMatrix& localMatrix) {
+                             SkShader::TileMode tm, SkUnitMapper* mapper,
+                             const SkMatrix& localMatrix) {
     SkPoint center0, center1;
     center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
                 SkScalarAve(pts[0].fY, pts[1].fY));
@@ -137,12 +147,13 @@ static SkShader* Make2ConicalZeroRadCenter(const SkPoint pts[2], const GradData&
                 SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4));
     return SkGradientShader::CreateTwoPointConical(center0, 0.f,
                                                    center0, (pts[1].fX - pts[0].fX) / 2,
-                                                   data.fColors, data.fPos, data.fCount, tm,
+                                                   data.fColors, data.fPos, data.fCount, tm, mapper,
                                                    0, &localMatrix);
 }
 
 static SkShader* Make2ConicalZeroRadOutside(const SkPoint pts[2], const GradData& data,
-                             SkShader::TileMode tm, const SkMatrix& localMatrix) {
+                             SkShader::TileMode tm, SkUnitMapper* mapper,
+                             const SkMatrix& localMatrix) {
     SkPoint center0, center1;
     SkScalar radius0 = 0.f;
     SkScalar radius1 = SkScalarDiv(pts[1].fX - pts[0].fX, 3);
@@ -151,11 +162,13 @@ static SkShader* Make2ConicalZeroRadOutside(const SkPoint pts[2], const GradData
     return SkGradientShader::CreateTwoPointConical(center0, radius0,
                                                    center1, radius1,
                                                    data.fColors, data.fPos,
-                                                   data.fCount, tm, 0, &localMatrix);
+                                                   data.fCount, tm, mapper,
+                                                   0, &localMatrix);
 }
 
 static SkShader* Make2ConicalZeroRadFlipOutside(const SkPoint pts[2], const GradData& data,
-                             SkShader::TileMode tm, const SkMatrix& localMatrix) {
+                             SkShader::TileMode tm, SkUnitMapper* mapper,
+                             const SkMatrix& localMatrix) {
     SkPoint center0, center1;
     SkScalar radius0 = 0.f;
     SkScalar radius1 = SkScalarDiv(pts[1].fX - pts[0].fX, 3);
@@ -164,11 +177,13 @@ static SkShader* Make2ConicalZeroRadFlipOutside(const SkPoint pts[2], const Grad
     return SkGradientShader::CreateTwoPointConical(center1, radius1,
                                                    center0, radius0,
                                                    data.fColors, data.fPos,
-                                                   data.fCount, tm, 0, &localMatrix);
+                                                   data.fCount, tm, mapper,
+                                                   0, &localMatrix);
 }
 
 static SkShader* Make2ConicalEdgeX(const SkPoint pts[2], const GradData& data,
-                             SkShader::TileMode tm, const SkMatrix& localMatrix) {
+                             SkShader::TileMode tm, SkUnitMapper* mapper,
+                             const SkMatrix& localMatrix) {
     SkPoint center0, center1;
     SkScalar radius0 = SkScalarDiv(pts[1].fX - pts[0].fX, 7);
     SkScalar radius1 = SkScalarDiv(pts[1].fX - pts[0].fX, 3);
@@ -178,11 +193,13 @@ static SkShader* Make2ConicalEdgeX(const SkPoint pts[2], const GradData& data,
     return SkGradientShader::CreateTwoPointConical(center0, radius0,
                                                    center1, radius1,
                                                    data.fColors, data.fPos,
-                                                   data.fCount, tm, 0, &localMatrix);
+                                                   data.fCount, tm, mapper,
+                                                   0, &localMatrix);
 }
 
 static SkShader* Make2ConicalEdgeY(const SkPoint pts[2], const GradData& data,
-                             SkShader::TileMode tm, const SkMatrix& localMatrix) {
+                             SkShader::TileMode tm, SkUnitMapper* mapper,
+                             const SkMatrix& localMatrix) {
     SkPoint center0, center1;
     SkScalar radius0 = SkScalarDiv(pts[1].fX - pts[0].fX, 7);
     SkScalar radius1 = SkScalarDiv(pts[1].fX - pts[0].fX, 3);
@@ -192,10 +209,12 @@ static SkShader* Make2ConicalEdgeY(const SkPoint pts[2], const GradData& data,
     return SkGradientShader::CreateTwoPointConical(center0, radius0,
                                                    center1, radius1,
                                                    data.fColors, data.fPos,
-                                                   data.fCount, tm, 0, &localMatrix);
+                                                   data.fCount, tm, mapper,
+                                                   0, &localMatrix);
 }
 static SkShader* Make2ConicalZeroRadEdgeX(const SkPoint pts[2], const GradData& data,
-                             SkShader::TileMode tm, const SkMatrix& localMatrix) {
+                             SkShader::TileMode tm, SkUnitMapper* mapper,
+                             const SkMatrix& localMatrix) {
     SkPoint center0, center1;
     SkScalar radius0 = 0.f;
     SkScalar radius1 = SkScalarDiv(pts[1].fX - pts[0].fX, 3);
@@ -205,11 +224,13 @@ static SkShader* Make2ConicalZeroRadEdgeX(const SkPoint pts[2], const GradData&
     return SkGradientShader::CreateTwoPointConical(center0, radius0,
                                                    center1, radius1,
                                                    data.fColors, data.fPos,
-                                                   data.fCount, tm, 0, &localMatrix);
+                                                   data.fCount, tm, mapper,
+                                                   0, &localMatrix);
 }
 
 static SkShader* Make2ConicalZeroRadEdgeY(const SkPoint pts[2], const GradData& data,
-                             SkShader::TileMode tm, const SkMatrix& localMatrix) {
+                             SkShader::TileMode tm, SkUnitMapper* mapper,
+                             const SkMatrix& localMatrix) {
     SkPoint center0, center1;
     SkScalar radius0 = 0.f;
     SkScalar radius1 = SkScalarDiv(pts[1].fX - pts[0].fX, 3);
@@ -219,11 +240,13 @@ static SkShader* Make2ConicalZeroRadEdgeY(const SkPoint pts[2], const GradData&
     return SkGradientShader::CreateTwoPointConical(center0, radius0,
                                                    center1, radius1,
                                                    data.fColors, data.fPos,
-                                                   data.fCount, tm, 0, &localMatrix);
+                                                   data.fCount, tm, mapper,
+                                                   0, &localMatrix);
 }
 
 static SkShader* Make2ConicalTouchX(const SkPoint pts[2], const GradData& data,
-                             SkShader::TileMode tm, const SkMatrix& localMatrix) {
+                             SkShader::TileMode tm, SkUnitMapper* mapper,
+                             const SkMatrix& localMatrix) {
     SkPoint center0, center1;
     SkScalar radius0 = SkScalarDiv(pts[1].fX - pts[0].fX, 7);
     SkScalar radius1 = SkScalarDiv(pts[1].fX - pts[0].fX, 3);
@@ -233,11 +256,13 @@ static SkShader* Make2ConicalTouchX(const SkPoint pts[2], const GradData& data,
     return SkGradientShader::CreateTwoPointConical(center0, radius0,
                                                    center1, radius1,
                                                    data.fColors, data.fPos,
-                                                   data.fCount, tm, 0, &localMatrix);
+                                                   data.fCount, tm, mapper,
+                                                   0, &localMatrix);
 }
 
 static SkShader* Make2ConicalTouchY(const SkPoint pts[2], const GradData& data,
-                             SkShader::TileMode tm, const SkMatrix& localMatrix) {
+                             SkShader::TileMode tm, SkUnitMapper* mapper,
+                             const SkMatrix& localMatrix) {
     SkPoint center0, center1;
     SkScalar radius0 = SkScalarDiv(pts[1].fX - pts[0].fX, 7);
     SkScalar radius1 = SkScalarDiv(pts[1].fX - pts[0].fX, 3);
@@ -247,11 +272,13 @@ static SkShader* Make2ConicalTouchY(const SkPoint pts[2], const GradData& data,
     return SkGradientShader::CreateTwoPointConical(center0, radius0,
                                                    center1, radius1,
                                                    data.fColors, data.fPos,
-                                                   data.fCount, tm, 0, &localMatrix);
+                                                   data.fCount, tm, mapper,
+                                                   0, &localMatrix);
 }
 
 static SkShader* Make2ConicalInsideSmallRad(const SkPoint pts[2], const GradData& data,
-                             SkShader::TileMode tm, const SkMatrix& localMatrix) {
+                             SkShader::TileMode tm, SkUnitMapper* mapper,
+                             const SkMatrix& localMatrix) {
     SkPoint center0, center1;
     center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
                 SkScalarAve(pts[0].fY, pts[1].fY));
@@ -259,12 +286,13 @@ static SkShader* Make2ConicalInsideSmallRad(const SkPoint pts[2], const GradData
                 SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4));
     return SkGradientShader::CreateTwoPointConical(center0, 0.0000000000000000001f,
                                                    center0, (pts[1].fX - pts[0].fX) / 2,
-                                                   data.fColors, data.fPos, data.fCount, tm,
+                                                   data.fColors, data.fPos, data.fCount, tm, mapper,
                                                    0, &localMatrix);
 }
 
 typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data,
-                               SkShader::TileMode tm, const SkMatrix& localMatrix);
+                               SkShader::TileMode tm, SkUnitMapper* mapper,
+                               const SkMatrix& localMatrix);
 
 static const GradMaker gGradMakersOutside[] = {
     Make2ConicalOutside, Make2ConicalOutsideFlip,
@@ -350,7 +378,7 @@ protected:
                     scale.postTranslate(25.f, 25.f);
                 }
 
-                SkShader* shader = gradMaker[j](pts, gGradData[i], tm, scale);
+                SkShader* shader = gradMaker[j](pts, gGradData[i], tm, NULL, scale);
                 paint.setShader(shader);
                 canvas->drawRect(r, paint);
                 shader->unref();
diff --git a/gm/gradients_no_texture.cpp b/gm/gradients_no_texture.cpp
index fcbba45ae7..2e75c9ed79 100644
--- a/gm/gradients_no_texture.cpp
+++ b/gm/gradients_no_texture.cpp
@@ -26,26 +26,32 @@ static const GradData gGradData[] = {
     { 4, gColors, NULL },
 };
 
-static SkShader* MakeLinear(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
-    return SkGradientShader::CreateLinear(pts, data.fColors, data.fPos, data.fCount, tm);
+static SkShader* MakeLinear(const SkPoint pts[2], const GradData& data,
+                            SkShader::TileMode tm, SkUnitMapper* mapper) {
+    return SkGradientShader::CreateLinear(pts, data.fColors, data.fPos,
+                                          data.fCount, tm, mapper);
 }
 
-static SkShader* MakeRadial(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
+static SkShader* MakeRadial(const SkPoint pts[2], const GradData& data,
+                            SkShader::TileMode tm, SkUnitMapper* mapper) {
     SkPoint center;
     center.set(SkScalarAve(pts[0].fX, pts[1].fX),
                SkScalarAve(pts[0].fY, pts[1].fY));
     return SkGradientShader::CreateRadial(center, center.fX, data.fColors,
-                                          data.fPos, data.fCount, tm);
+                                          data.fPos, data.fCount, tm, mapper);
 }
 
-static SkShader* MakeSweep(const SkPoint pts[2], const GradData& data, SkShader::TileMode) {
+static SkShader* MakeSweep(const SkPoint pts[2], const GradData& data,
+                           SkShader::TileMode, SkUnitMapper* mapper) {
     SkPoint center;
     center.set(SkScalarAve(pts[0].fX, pts[1].fX),
                SkScalarAve(pts[0].fY, pts[1].fY));
-    return SkGradientShader::CreateSweep(center.fX, center.fY, data.fColors, data.fPos, data.fCount);
+    return SkGradientShader::CreateSweep(center.fX, center.fY, data.fColors,
+                                         data.fPos, data.fCount, mapper);
 }
 
-static SkShader* Make2Radial(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
+static SkShader* Make2Radial(const SkPoint pts[2], const GradData& data,
+                             SkShader::TileMode tm, SkUnitMapper* mapper) {
     SkPoint center0, center1;
     center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
                 SkScalarAve(pts[0].fY, pts[1].fY));
@@ -54,10 +60,11 @@ static SkShader* Make2Radial(const SkPoint pts[2], const GradData& data, SkShade
     return SkGradientShader::CreateTwoPointRadial(
         center1, (pts[1].fX - pts[0].fX) / 7,
         center0, (pts[1].fX - pts[0].fX) / 2,
-        data.fColors, data.fPos, data.fCount, tm);
+        data.fColors, data.fPos, data.fCount, tm, mapper);
 }
 
-static SkShader* Make2Conical(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
+static SkShader* Make2Conical(const SkPoint pts[2], const GradData& data,
+                              SkShader::TileMode tm, SkUnitMapper* mapper) {
     SkPoint center0, center1;
     SkScalar radius0 = SkScalarDiv(pts[1].fX - pts[0].fX, 10);
     SkScalar radius1 = SkScalarDiv(pts[1].fX - pts[0].fX, 3);
@@ -66,12 +73,12 @@ static SkShader* Make2Conical(const SkPoint pts[2], const GradData& data, SkShad
     return SkGradientShader::CreateTwoPointConical(center1, radius1,
                                                    center0, radius0,
                                                    data.fColors, data.fPos,
-                                                   data.fCount, tm);
+                                                   data.fCount, tm, mapper);
 }
 
 
-typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm);
-
+typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data,
+                               SkShader::TileMode tm, SkUnitMapper* mapper);
 static const GradMaker gGradMakers[] = {
     MakeLinear, MakeRadial, MakeSweep, Make2Radial, Make2Conical,
 };
@@ -106,7 +113,7 @@ protected:
             for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); ++i) {
                 canvas->save();
                 for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); ++j) {
-                    SkShader* shader = gGradMakers[j](kPts, gGradData[i], kTM);
+                    SkShader* shader = gGradMakers[j](kPts, gGradData[i], kTM, NULL);
                     paint.setShader(shader)->unref();
                     paint.setAlpha(kAlphas[a]);
                     canvas->drawRect(kRect, paint);
diff --git a/gm/shaderbounds.cpp b/gm/shaderbounds.cpp
index f82985bf52..f0b8b9781d 100644
--- a/gm/shaderbounds.cpp
+++ b/gm/shaderbounds.cpp
@@ -19,7 +19,7 @@ static SkShader* MakeLinear(SkScalar width, SkScalar height, bool alternate,
     colors[1] = SK_ColorYELLOW;
   }
   return SkGradientShader::CreateLinear(pts, colors, NULL, 2,
-                                        SkShader::kClamp_TileMode, 0, &localMatrix);
+                                        SkShader::kClamp_TileMode, NULL, 0, &localMatrix);
 }
 
 ///////////////////////////////////////////////////////////////////////////////
diff --git a/gm/shadertext.cpp b/gm/shadertext.cpp
index 292acdd7a6..b9e28be898 100644
--- a/gm/shadertext.cpp
+++ b/gm/shadertext.cpp
@@ -1,13 +1,14 @@
+
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
-
 #include "gm.h"
 #include "SkCanvas.h"
 #include "SkGradientShader.h"
+#include "SkUnitMappers.h"
 
 namespace skiagm {
 
@@ -22,9 +23,15 @@ static void makebm(SkBitmap* bm, int w, int h) {
     SkScalar    pos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
     SkPaint     paint;
 
+    SkUnitMapper*   um = NULL;
+
+    um = new SkCosineMapper;
+
+    SkAutoUnref au(um);
+
     paint.setDither(true);
     paint.setShader(SkGradientShader::CreateLinear(pts, colors, pos,
-                SK_ARRAY_COUNT(colors), SkShader::kClamp_TileMode))->unref();
+                SK_ARRAY_COUNT(colors), SkShader::kClamp_TileMode, um))->unref();
     canvas.drawPaint(paint);
 }
 
@@ -54,26 +61,32 @@ static const GradData gGradData[] = {
     { 5, gColors, NULL },
 };
 
-static SkShader* MakeLinear(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
-    return SkGradientShader::CreateLinear(pts, data.fColors, data.fPos, data.fCount, tm);
+static SkShader* MakeLinear(const SkPoint pts[2], const GradData& data,
+                            SkShader::TileMode tm, SkUnitMapper* mapper) {
+    return SkGradientShader::CreateLinear(pts, data.fColors, data.fPos,
+                                          data.fCount, tm, mapper);
 }
 
-static SkShader* MakeRadial(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
+static SkShader* MakeRadial(const SkPoint pts[2], const GradData& data,
+                            SkShader::TileMode tm, SkUnitMapper* mapper) {
     SkPoint center;
     center.set(SkScalarAve(pts[0].fX, pts[1].fX),
                SkScalarAve(pts[0].fY, pts[1].fY));
     return SkGradientShader::CreateRadial(center, center.fX, data.fColors,
-                                          data.fPos, data.fCount, tm);
+                                          data.fPos, data.fCount, tm, mapper);
 }
 
-static SkShader* MakeSweep(const SkPoint pts[2], const GradData& data, SkShader::TileMode) {
+static SkShader* MakeSweep(const SkPoint pts[2], const GradData& data,
+                           SkShader::TileMode, SkUnitMapper* mapper) {
     SkPoint center;
     center.set(SkScalarAve(pts[0].fX, pts[1].fX),
                SkScalarAve(pts[0].fY, pts[1].fY));
-    return SkGradientShader::CreateSweep(center.fX, center.fY, data.fColors, data.fPos, data.fCount);
+    return SkGradientShader::CreateSweep(center.fX, center.fY, data.fColors,
+                                         data.fPos, data.fCount, mapper);
 }
 
-static SkShader* Make2Radial(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
+static SkShader* Make2Radial(const SkPoint pts[2], const GradData& data,
+                           SkShader::TileMode tm, SkUnitMapper* mapper) {
     SkPoint center0, center1;
     center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
                 SkScalarAve(pts[0].fY, pts[1].fY));
@@ -82,11 +95,11 @@ static SkShader* Make2Radial(const SkPoint pts[2], const GradData& data, SkShade
     return SkGradientShader::CreateTwoPointRadial(
                             center1, (pts[1].fX - pts[0].fX) / 7,
                             center0, (pts[1].fX - pts[0].fX) / 2,
-                            data.fColors, data.fPos, data.fCount, tm);
+                            data.fColors, data.fPos, data.fCount, tm, mapper);
 }
 
-typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm);
-    
+typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data,
+                     SkShader::TileMode tm, SkUnitMapper* mapper);
 static const GradMaker gGradMakers[] = {
     MakeLinear, MakeRadial, MakeSweep, Make2Radial
 };
@@ -141,7 +154,8 @@ protected:
             for (size_t m = 0; m < SK_ARRAY_COUNT(gGradMakers); ++m) {
                 shaders[shdIdx++] = gGradMakers[m](pts,
                                                    gGradData[d],
-                                                   SkShader::kClamp_TileMode);
+                                                   SkShader::kClamp_TileMode,
+                                                   NULL);
             }
         }
         for (size_t tx = 0; tx < SK_ARRAY_COUNT(tileModes); ++tx) {
diff --git a/gm/shadertext2.cpp b/gm/shadertext2.cpp
index 27b517517e..d6a9a721cd 100644
--- a/gm/shadertext2.cpp
+++ b/gm/shadertext2.cpp
@@ -7,6 +7,7 @@
 #include "gm.h"
 #include "SkCanvas.h"
 #include "SkGradientShader.h"
+#include "SkUnitMappers.h"
 
 namespace skiagm {
 
@@ -25,8 +26,14 @@ static void makebm(SkBitmap* bm, int w, int h) {
 
     SkPaint     paint;
 
+    SkUnitMapper*   um = NULL;
+
+    um = new SkCosineMapper;
+
+    SkAutoUnref au(um);
+
     paint.setShader(SkGradientShader::CreateLinear(kPts0, kColors0, kPos,
-                    SK_ARRAY_COUNT(kColors0), SkShader::kClamp_TileMode))->unref();
+                    SK_ARRAY_COUNT(kColors0), SkShader::kClamp_TileMode, um))->unref();
     canvas.drawPaint(paint);
     paint.setShader(SkGradientShader::CreateLinear(kPts1, kColors1, kPos,
                     SK_ARRAY_COUNT(kColors1), SkShader::kClamp_TileMode))->unref();
diff --git a/gm/shadertext3.cpp b/gm/shadertext3.cpp
index 3c6400d8d6..8aa6e6965c 100644
--- a/gm/shadertext3.cpp
+++ b/gm/shadertext3.cpp
@@ -4,10 +4,10 @@
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
-
 #include "gm.h"
 #include "SkCanvas.h"
 #include "SkGradientShader.h"
+#include "SkUnitMappers.h"
 
 namespace skiagm {
 
@@ -26,8 +26,14 @@ static void makebm(SkBitmap* bm, int w, int h) {
 
     SkPaint     paint;
 
+    SkUnitMapper*   um = NULL;
+
+    um = new SkCosineMapper;
+
+    SkAutoUnref au(um);
+
     paint.setShader(SkGradientShader::CreateLinear(kPts0, kColors0, kPos,
-                    SK_ARRAY_COUNT(kColors0), SkShader::kClamp_TileMode))->unref();
+                    SK_ARRAY_COUNT(kColors0), SkShader::kClamp_TileMode, um))->unref();
     canvas.drawPaint(paint);
     paint.setShader(SkGradientShader::CreateLinear(kPts1, kColors1, kPos,
                     SK_ARRAY_COUNT(kColors1), SkShader::kClamp_TileMode))->unref();
diff --git a/gm/tilemodes.cpp b/gm/tilemodes.cpp
index 99d3a4708b..e04c52ae0f 100644
--- a/gm/tilemodes.cpp
+++ b/gm/tilemodes.cpp
@@ -16,6 +16,7 @@
 
 // effects
 #include "SkGradientShader.h"
+#include "SkUnitMappers.h"
 #include "SkBlurDrawLooper.h"
 
 static void makebm(SkBitmap* bm, SkColorType ct, int w, int h) {
@@ -28,9 +29,16 @@ static void makebm(SkBitmap* bm, SkColorType ct, int w, int h) {
     SkScalar    pos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
     SkPaint     paint;
 
+    SkUnitMapper*   um = NULL;
+
+    um = new SkCosineMapper;
+//    um = new SkDiscreteMapper(12);
+
+    SkAutoUnref au(um);
+
     paint.setDither(true);
     paint.setShader(SkGradientShader::CreateLinear(pts, colors, pos,
-                SK_ARRAY_COUNT(colors), SkShader::kClamp_TileMode))->unref();
+                SK_ARRAY_COUNT(colors), SkShader::kClamp_TileMode, um))->unref();
     canvas.drawPaint(paint);
 }
 
diff --git a/gm/tilemodes_scaled.cpp b/gm/tilemodes_scaled.cpp
index 88a070afb5..a79002b56b 100644
--- a/gm/tilemodes_scaled.cpp
+++ b/gm/tilemodes_scaled.cpp
@@ -17,6 +17,7 @@
 
 // effects
 #include "SkGradientShader.h"
+#include "SkUnitMappers.h"
 #include "SkBlurDrawLooper.h"
 
 static void makebm(SkBitmap* bm, SkColorType ct, int w, int h) {
@@ -29,9 +30,16 @@ static void makebm(SkBitmap* bm, SkColorType ct, int w, int h) {
     SkScalar    pos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
     SkPaint     paint;
 
+    SkUnitMapper*   um = NULL;
+
+    um = new SkCosineMapper;
+//    um = new SkDiscreteMapper(12);
+
+    SkAutoUnref au(um);
+
     paint.setDither(true);
     paint.setShader(SkGradientShader::CreateLinear(pts, colors, pos,
-                SK_ARRAY_COUNT(colors), SkShader::kClamp_TileMode))->unref();
+                SK_ARRAY_COUNT(colors), SkShader::kClamp_TileMode, um))->unref();
     canvas.drawPaint(paint);
 }