add explicit bench for raw bitmapscaler

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1586803003

patch from issue 1586803003 at patchset 20001 (http://crrev.com/1586803003#ps20001)

TBR=

Review URL: https://codereview.chromium.org/1588113002

1 files changed, 48 insertions, 0 deletions

diff --git a/bench/BitmapScaleBench.cpp b/bench/BitmapScaleBench.cpp
index 37ce7cf65a..2e8f72e03c 100644
--- a/bench/BitmapScaleBench.cpp
+++ b/bench/BitmapScaleBench.cpp
@@ -110,3 +110,51 @@ DEF_BENCH(return new BitmapFilterScaleBench(90, 30);)
 DEF_BENCH(return new BitmapFilterScaleBench(90, 10);)
 DEF_BENCH(return new BitmapFilterScaleBench(256, 64);)
 DEF_BENCH(return new BitmapFilterScaleBench(64, 256);)
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+
+#include "SkBitmapScaler.h"
+
+class PixmapScalerBench: public Benchmark {
+    SkBitmapScaler::ResizeMethod    fMethod;
+    SkString                        fName;
+    SkBitmap                        fSrc, fDst;
+
+public:
+    PixmapScalerBench(SkBitmapScaler::ResizeMethod method, const char suffix[]) : fMethod(method) {
+        fName.printf("pixmapscaler_%s", suffix);
+    }
+    
+protected:
+    const char* onGetName() override {
+        return fName.c_str();
+    }
+    
+    SkIPoint onGetSize() override { return{ 100, 100 }; }
+
+    bool isSuitableFor(Backend backend) override {
+        return backend == kNonRendering_Backend;
+    }
+
+    void onDelayedSetup() override {
+        fSrc.allocN32Pixels(640, 480);
+        fDst.allocN32Pixels(300, 250);
+    }
+    
+    void onDraw(int loops, SkCanvas*) override {
+        SkPixmap src, dst;
+        fSrc.peekPixels(&src);
+        fDst.peekPixels(&dst);
+        for (int i = 0; i < loops * 16; i++) {
+            SkBitmapScaler::Resize(dst, src, fMethod);
+        }
+    }
+
+private:
+    typedef Benchmark INHERITED;
+};
+DEF_BENCH( return new PixmapScalerBench(SkBitmapScaler::RESIZE_LANCZOS3, "lanczos");  )
+DEF_BENCH( return new PixmapScalerBench(SkBitmapScaler::RESIZE_MITCHELL, "mitchell"); )
+DEF_BENCH( return new PixmapScalerBench(SkBitmapScaler::RESIZE_HAMMING,  "hamming");  )
+DEF_BENCH( return new PixmapScalerBench(SkBitmapScaler::RESIZE_TRIANGLE, "triangle"); )
+DEF_BENCH( return new PixmapScalerBench(SkBitmapScaler::RESIZE_BOX,      "box");      )