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

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

Index: third_party/WebKit/Source/platform/image-decoders/ImageFrame.cpp
diff --git a/third_party/WebKit/Source/platform/image-decoders/ImageFrame.cpp b/third_party/WebKit/Source/platform/image-decoders/ImageFrame.cpp
index 1390439648a4bbd767300fe45c3ee736ab1ead0f..1c2546b46f9b2e9ead2029a2f0bf131a46a61113 100644
--- a/third_party/WebKit/Source/platform/image-decoders/ImageFrame.cpp
+++ b/third_party/WebKit/Source/platform/image-decoders/ImageFrame.cpp
@@ -93,6 +93,17 @@ bool ImageFrame::copyBitmapData(const ImageFrame& other)
     return other.m_bitmap.copyTo(&m_bitmap, other.m_bitmap.colorType());
 }
 
+void ImageFrame::takeBitmapData(ImageFrame& other)
+{
+    if (this == &other)
+        return;
+
+    m_hasAlpha = other.m_hasAlpha;
+    m_bitmap.reset();
+    m_bitmap.swap(other.m_bitmap);
+    other.m_status = FrameEmpty;
+}
+
 bool ImageFrame::setSize(int newWidth, int newHeight)
 {
     // setSize() should only be called once, it leaks memory otherwise.