Add a origin clean flag in ImageBitmap class

third_party/WebKit/Source/platform/graphics/StaticBitmapImage.h

Index: third_party/WebKit/Source/platform/graphics/StaticBitmapImage.h
diff --git a/third_party/WebKit/Source/platform/graphics/StaticBitmapImage.h b/third_party/WebKit/Source/platform/graphics/StaticBitmapImage.h
index b2e84d95fa34be8503f1ca9387829ea6fda84406..bd36802ec110e53a8839116912b8bc28f06a2fe2 100644
--- a/third_party/WebKit/Source/platform/graphics/StaticBitmapImage.h
+++ b/third_party/WebKit/Source/platform/graphics/StaticBitmapImage.h
@@ -23,10 +23,13 @@ public:
 
     PassRefPtr<SkImage> imageForCurrentFrame() override;
 
+    bool originClean() const { return m_isOriginClean; }
+    void setOriginClean(bool flag) { m_isOriginClean = flag; }
 protected:
     StaticBitmapImage(PassRefPtr<SkImage>);
 
     RefPtr<SkImage> m_image;
+    bool m_isOriginClean = true;
 };
 
 } // namespace blink