Make DisplayItemClient an interface

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

Index: third_party/WebKit/Source/platform/graphics/ImageBuffer.h
diff --git a/third_party/WebKit/Source/platform/graphics/ImageBuffer.h b/third_party/WebKit/Source/platform/graphics/ImageBuffer.h
index 1fd37ba6f4f2b64307a8a04923c9f9ad3dfce337..9c39d9679381b257d7b8529582f848b0bebef732 100644
--- a/third_party/WebKit/Source/platform/graphics/ImageBuffer.h
+++ b/third_party/WebKit/Source/platform/graphics/ImageBuffer.h
@@ -67,7 +67,7 @@ enum Multiply {
     Unmultiplied
 };
 
-class PLATFORM_EXPORT ImageBuffer {
+class PLATFORM_EXPORT ImageBuffer /* : public DisplayItemClient */ {

[pdr., 2015/12/05 21:39:19]

Is this not needed? Can we remove both DisplayItemClient displayItemClient() and
String debugName() ?

[Xianzhu, 2015/12/07 17:14:01]

I added it and tried compile to see if it's really needed but forgot to remove
it.

Done.

     WTF_MAKE_NONCOPYABLE(ImageBuffer); USING_FAST_MALLOC(ImageBuffer);
 public:
     static PassOwnPtr<ImageBuffer> create(const IntSize&, OpacityMode = NonOpaque, ImageInitializationMode = InitializeImagePixels);
@@ -130,7 +130,6 @@ public:
     PassRefPtr<SkImage> newSkImageSnapshot(AccelerationHint) const;
     PassRefPtr<Image> newImageSnapshot(AccelerationHint = PreferNoAcceleration) const;
 
-    DisplayItemClient displayItemClient() const { return toDisplayItemClient(this); }
     String debugName() const { return "ImageBuffer"; }
 
     void draw(GraphicsContext*, const FloatRect&, const FloatRect*, SkXfermode::Mode);