GIF Animations "clear from cache related glitch" fix

third_party/WebKit/Source/platform/graphics/ImageFrameGenerator.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 276 matching lines @@
     // the decoder. For multi-frame images, if all frames in the image are
     // decoded, we remove the decoder.
     bool removeDecoder;
 
     if (m_isMultiFrame) {
         size_t decodedFrameCount = 0;
         for (Vector<bool>::iterator it = m_frameComplete.begin(); it != m_frameComplete.end(); ++it) {
             if (*it)
                 decodedFrameCount++;
         }
-        removeDecoder = m_frameCount && (decodedFrameCount == m_frameCount);
+        removeDecoder = m_frameCount && (decodedFrameCount == m_frameCount) && (index == m_frameCount - 1);
     } else {
         removeDecoder = complete;
     }
 
     if (resumeDecoding) {
         if (removeDecoder) {
             ImageDecodingStore::instance().removeDecoder(this, decoder);
             m_frameComplete.clear();
         } else {
             ImageDecodingStore::instance().unlockDecoder(this, decoder);
@@ skipping 105 matching lines @@
     // Setting a dummy ImagePlanes object signals to the decoder that we want to do YUV decoding.
     decoder->setData(data, allDataReceived);
     OwnPtr<ImagePlanes> dummyImagePlanes = adoptPtr(new ImagePlanes);
     decoder->setImagePlanes(dummyImagePlanes.release());
 
     ASSERT(componentSizes);
     return updateYUVComponentSizes(decoder.get(), componentSizes, ImageDecoder::SizeForMemoryAllocation);
 }
 
 } // namespace blink