Use SkImage as a backing store for copying 2d Contexts to ImageBitmaps.

Source/core/platform/graphics/GraphicsContext.cpp

Index: Source/core/platform/graphics/GraphicsContext.cpp
diff --git a/Source/core/platform/graphics/GraphicsContext.cpp b/Source/core/platform/graphics/GraphicsContext.cpp
index c9da39c0e1a3c6ff6f3253f8e695f52315c73e6a..0a18abb222f84ec43a5096d5beb842dcd5be6452 100644
--- a/Source/core/platform/graphics/GraphicsContext.cpp
+++ b/Source/core/platform/graphics/GraphicsContext.cpp
@@ -39,6 +39,7 @@
 #include "third_party/skia/include/core/SkColorFilter.h"
 #include "third_party/skia/include/core/SkData.h"
 #include "third_party/skia/include/core/SkDevice.h"
+#include "third_party/skia/include/core/SkImage.h"
 #include "third_party/skia/include/core/SkRRect.h"
 #include "third_party/skia/include/core/SkRefCnt.h"
 #include "third_party/skia/include/effects/SkBlurMaskFilter.h"
@@ -1017,6 +1018,24 @@ void GraphicsContext::drawImage(Image* image, const FloatRect& dest, const Float
         setImageInterpolationQuality(previousInterpolationQuality);
 }
 
+void GraphicsContext::drawImage(SkImage* image, const FloatRect& dest, const FloatRect& src, CompositeOperator op, BlendMode blendMode, bool useLowQualityScale)
+{
+    if (paintingDisabled() || !image)
+        return;
+
+    InterpolationQuality previousInterpolationQuality = InterpolationDefault;
+
+    if (useLowQualityScale) {
+        previousInterpolationQuality = imageInterpolationQuality();
+        setImageInterpolationQuality(InterpolationLow);
+    }
+
+    image->draw(canvas(), dest, src, 0);
+
+    if (useLowQualityScale)
+        setImageInterpolationQuality(previousInterpolationQuality);
+}
+
 void GraphicsContext::drawTiledImage(Image* image, const IntRect& destRect, const IntPoint& srcPoint, const IntSize& tileSize, CompositeOperator op, bool useLowQualityScale, BlendMode blendMode)
 {
     if (paintingDisabled() || !image)