Add support for Animated PNG

third_party/WebKit/Source/platform/image-decoders/webp/WEBPImageDecoder.cpp

 /*
  * Copyright (C) 2010 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
@@ skipping 399 matching lines @@
 }
 
 void WEBPImageDecoder::decode(size_t index) {
   if (failed())
     return;
 
   Vector<size_t> framesToDecode = findFramesToDecode(index);
 
   DCHECK(m_demux);
   for (auto i = framesToDecode.rbegin(); i != framesToDecode.rend(); ++i) {
-    if ((m_formatFlags & ANIMATION_FLAG) && !initFrameBuffer(*i))
+    if ((m_formatFlags & ANIMATION_FLAG) && !initFrameBuffer(*i)) {
+      setFailed();
       return;
+    }
+
     WebPIterator webpFrame;
     if (!WebPDemuxGetFrame(m_demux, *i + 1, &webpFrame)) {
       setFailed();
     } else {
       decodeSingleFrame(webpFrame.fragment.bytes, webpFrame.fragment.size, *i);
       WebPDemuxReleaseIterator(&webpFrame);
     }
     if (failed())
       return;
 
@@ skipping 77 matching lines @@
         return false;
       }
     // FALLTHROUGH
     default:
       clear();
       return setFailed();
   }
 }
 
 }  // namespace blink