Revert of remove unused (by clients) SkPathUtils (patchset #1 id:1 of https://codereview.chromium.org/1088383003/)

Reason for revert:
This change is causing the DEPS roll to fail:

http://build.chromium.org/p/tryserver.chromium.linux/builders/android_chromium_gn_compile_rel/builds/78771/steps/gn/logs/stdio

Original issue's description:
> remove unused (by clients) SkPathUtils
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/aab35d91b8b80acd1902594bbf542083fdfa4bb7

TBR=scroggo@google.com,reed@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1060703003

1 files changed, 72 insertions, 0 deletions

diff --git a/bench/PathUtilsBench.cpp b/bench/PathUtilsBench.cpp
new file mode 100644
index 0000000000..6c8086fb9d
--- /dev/null
+++ b/bench/PathUtilsBench.cpp
@@ -0,0 +1,72 @@
+/*
+ * 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 "Benchmark.h"
+#include "SkCanvas.h"
+#include "SkPathUtils.h"
+#include "SkRandom.h"
+#include "SkString.h"
+#include "SkTime.h"
+
+#define H 16
+#define W 16
+#define STRIDE 2
+
+//this function is redefined for sample, test, and bench. is there anywhere
+// I can put it to avoid code duplcation?
+static void fillRandomBits( int chars, char* bits ){
+    SkRandom rand(SkTime::GetMSecs());
+
+    for (int i = 0; i < chars; ++i){
+        bits[i] = rand.nextU();
+    }
+}
+
+static void path_proc(char* bits, SkPath* path) {
+    SkPathUtils::BitsToPath_Path(path, bits, H, W, STRIDE);
+}
+
+static void region_proc(char* bits, SkPath* path) {
+    SkPathUtils::BitsToPath_Region(path, bits, H, W, STRIDE);
+}
+
+/// Emulates the mix of rects blitted by gmail during scrolling
+class PathUtilsBench : public Benchmark {
+    typedef void (*Proc)(char*, SkPath*);
+
+    Proc fProc;
+    SkString fName;
+    char* bits[H * STRIDE];
+
+public:
+    PathUtilsBench(Proc proc, const char name[])  {
+        fProc = proc;
+        fName.printf("pathUtils_%s", name);
+
+
+    }
+
+protected:
+    virtual const char* onGetName() { return fName.c_str(); }
+
+    virtual void onDraw(const int loops, SkCanvas* canvas) {
+
+        for (int i = 0; i < loops; ++i){
+            //create a random 16x16 bitmap
+            fillRandomBits(H * STRIDE, (char*) &bits);
+
+            //use passed function pointer to handle it
+            SkPath path;
+            fProc( (char*) &bits, &path);
+        }
+    }
+
+private:
+    typedef Benchmark INHERITED;
+};
+
+DEF_BENCH( return SkNEW_ARGS(PathUtilsBench, (path_proc, "path")); )
+DEF_BENCH( return SkNEW_ARGS(PathUtilsBench, (region_proc, "region")); )