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..fe70dedc4e3b26b862176bcd71e41d8c4b45df82 100644
--- a/third_party/WebKit/Source/platform/image-decoders/ImageFrame.h
+++ b/third_party/WebKit/Source/platform/image-decoders/ImageFrame.h
@@ -93,6 +93,9 @@ public:
     // the other.  Returns whether the copy succeeded.
     bool copyBitmapData(const ImageFrame&);
 
+    // Takes over other's frame pixel data. Other becomes empty after this call.

[Peter Kasting, 2016/07/19 03:04:17]

Nit: To match declaration above as closely as possible:

    // Moves the bitmap data from the provided frame to this one, leaving the
    // provided frame empty.
    void moveBitmapData(ImageFrame*);

This also fixes a violation of
http://google.github.io/styleguide/cppguide.html#Reference_Arguments .

[aleksandar.stojiljkovic, 2016/07/19 11:10:40]

Done.

+    void takeBitmapData(ImageFrame& other);
+
     // Copies the pixel data at [(startX, startY), (endX, startY)) to the
     // same X-coordinates on each subsequent row up to but not including
     // endY.