Fix ImageDecoder::frameIsCompleteAtIndex - fully received instead of decoded.

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 148 matching lines @@
 void WEBPImageDecoder::onSetData(SegmentReader*)
 {
     m_haveAlreadyParsedThisData = false;
 }
 
 int WEBPImageDecoder::repetitionCount() const
 {
     return failed() ? cAnimationLoopOnce : m_repetitionCount;
 }
 
-bool WEBPImageDecoder::frameIsCompleteAtIndex(size_t index) const
+bool WEBPImageDecoder::frameIsFullyReceivedAtIndex(size_t index) const
 {
-    if (!m_demux || m_demuxState <= WEBP_DEMUX_PARSING_HEADER)
-        return false;
+    ASSERT(haveUpdatedFrameCount());
     if (!(m_formatFlags & ANIMATION_FLAG))
-        return ImageDecoder::frameIsCompleteAtIndex(index);
-    bool frameIsLoadedAtIndex = index < m_frameBufferCache.size();
-    return frameIsLoadedAtIndex;
+        return ImageDecoder::frameIsFullyReceivedAtIndex(index);
+
+    // Multi-frame WebP frame gets added to m_frameBufferCache through
+    // initializeNewFrame() only when the frame data is fully received.
+    return index < m_frameBufferCache.size();
 }
 
 float WEBPImageDecoder::frameDurationAtIndex(size_t index) const
 {
     return index < m_frameBufferCache.size() ? m_frameBufferCache[index].duration() : 0;
 }
 
 bool WEBPImageDecoder::updateDemuxer()
 {
     if (failed())
@@ skipping 318 matching lines @@
             return false;
         }
         // FALLTHROUGH
     default:
         clear();
         return setFailed();
     }
 }
 
 } // namespace blink