Save a bitmap copy when advancing to dependent GIF and WebP animation frames

third_party/WebKit/Source/platform/image-decoders/ImageFrame.h

Index: third_party/WebKit/Source/platform/image-decoders/ImageFrame.h
diff --git a/third_party/WebKit/Source/platform/image-decoders/ImageFrame.h b/third_party/WebKit/Source/platform/image-decoders/ImageFrame.h
index 7a51c75e23dfa7f6aa20ba419fc6ded626c89d71..0f69d95c8a37c6ce7596cdbc11904c9d7d553b6d 100644
--- a/third_party/WebKit/Source/platform/image-decoders/ImageFrame.h
+++ b/third_party/WebKit/Source/platform/image-decoders/ImageFrame.h
@@ -93,6 +93,10 @@ public:
     // the other.  Returns whether the copy succeeded.
     bool copyBitmapData(const ImageFrame&);
 
+    // Moves the bitmap data from the provided frame to this one, leaving the
+    // provided frame empty.
+    void takeBitmapData(ImageFrame*);
+
     // Copies the pixel data at [(startX, startY), (endX, startY)) to the
     // same X-coordinates on each subsequent row up to but not including
     // endY.