Add support for Animated PNG

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

 /*
  * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) Research In Motion Limited 2009-2010. 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
@@ skipping 388 matching lines @@
   static bool sizeCalculationMayOverflow(unsigned width, unsigned height) {
     unsigned long long total_size = static_cast<unsigned long long>(width) *
                                     static_cast<unsigned long long>(height);
     return total_size > ((1 << 29) - 1);
   }
 
   bool m_purgeAggressively;
 
   // This methods gets called at the end of initFrameBuffer. Subclasses can do
   // format specific initialization, for e.g. alpha settings, here.
-  virtual void onInitFrameBuffer(size_t){};
+  virtual bool onInitFrameBuffer(size_t) { return true; };
 
   // Called by initFrameBuffer to determine if it can take the bitmap of the
   // previous frame. This condition is different for GIF and WEBP.
   virtual bool canReusePreviousFrameBuffer(size_t) const { return false; }
 
   IntSize m_size;
   bool m_sizeAvailable = false;
   bool m_isAllDataReceived = false;
   bool m_failed = false;
   bool m_hasHistogrammedColorSpace = false;
 
   sk_sp<SkColorSpace> m_embeddedColorSpace = nullptr;
   bool m_sourceToTargetColorTransformNeedsUpdate = false;
   std::unique_ptr<SkColorSpaceXform> m_sourceToTargetColorTransform;
 };
 
 }  // namespace blink
 
 #endif