Implement OffscreenCanvas Accelerated 2D commit()

third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.h

Index: third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.h
diff --git a/third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.h b/third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.h
index ac0bf036a7d7b3aea2e96dd9429544a2680bfa88..ca862fb0a378160b10b3ac014b1bb7a0bb843bb3 100644
--- a/third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.h
+++ b/third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.h
@@ -39,6 +39,7 @@ public:
     ~OffscreenCanvasRenderingContext2D() override;
     ContextType getContextType() const override { return Context2d; }
     bool is2d() const override { return true; }
+    bool isAccelerated() const override;
     void setOffscreenCanvasGetContextResult(OffscreenRenderingContext&) final;
     void setIsHidden(bool) final { ASSERT_NOT_REACHED(); }
     void stop() final { ASSERT_NOT_REACHED(); }
@@ -86,6 +87,8 @@ private:
     std::unique_ptr<ImageBuffer> m_imageBuffer;
 
     bool isPaintable() const final;
+
+    PassRefPtr<StaticBitmapImage> transferToStaticImageBitmap();
 };
 
 DEFINE_TYPE_CASTS(OffscreenCanvasRenderingContext2D, CanvasRenderingContext, context,