Pull up clearCacheExceptFrame to ImageDecoder.

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 247 matching lines @@
   // decoded.
   buffer.setHasAlpha(true);
 }
 
 bool WEBPImageDecoder::canReusePreviousFrameBuffer(size_t frameIndex) const {
   DCHECK(frameIndex < m_frameBufferCache.size());
   return m_frameBufferCache[frameIndex].getAlphaBlendSource() !=
          ImageFrame::BlendAtopPreviousFrame;
 }
 
-size_t WEBPImageDecoder::clearCacheExceptFrame(size_t clearExceptFrame) {
-  // Don't clear if there are no frames, or only one.
-  if (m_frameBufferCache.size() <= 1)
-    return 0;
-
-  // If |clearExceptFrame| has status FrameComplete, we only preserve that
-  // frame.  Otherwise, we *also* preserve the most recent previous frame with
-  // status FrameComplete whose data will be required to decode
-  // |clearExceptFrame|, either in initFrameBuffer() or ApplyPostProcessing().
-  // This frame index is stored in |clearExceptFrame2|.  All other frames can
-  // be cleared.
-  size_t clearExceptFrame2 = kNotFound;
-  if (clearExceptFrame < m_frameBufferCache.size() &&
-      m_frameBufferCache[clearExceptFrame].getStatus() !=
-          ImageFrame::FrameComplete) {
-    clearExceptFrame2 =
-        m_frameBufferCache[clearExceptFrame].requiredPreviousFrameIndex();
-  }
-
-  while ((clearExceptFrame2 < m_frameBufferCache.size()) &&
-         (m_frameBufferCache[clearExceptFrame2].getStatus() !=
-          ImageFrame::FrameComplete)) {
-    clearExceptFrame2 =
-        m_frameBufferCache[clearExceptFrame2].requiredPreviousFrameIndex();
-  }
-
-  return clearCacheExceptTwoFrames(clearExceptFrame, clearExceptFrame2);
-}
-
 void WEBPImageDecoder::clearFrameBuffer(size_t frameIndex) {
   if (m_demux && m_demuxState >= WEBP_DEMUX_PARSED_HEADER &&
       m_frameBufferCache[frameIndex].getStatus() == ImageFrame::FramePartial) {
     // Clear the decoder state so that this partial frame can be decoded again
     // when requested.
     clearDecoder();
   }
   ImageDecoder::clearFrameBuffer(frameIndex);
 }
 
@@ skipping 231 matching lines @@
         return false;
       }
     // FALLTHROUGH
     default:
       clear();
       return setFailed();
   }
 }
 
 }  // namespace blink