Track positions of dimensions in image files

third_party/WebKit/Source/platform/image-decoders/gif/GIFImageDecoder.h

 /*
  * Copyright (C) 2006 Apple Computer, 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 43 matching lines @@
     size_t clearCacheExceptFrame(size_t) override;
     // CAUTION: setFailed() deletes |m_reader|.  Be careful to avoid
     // accessing deleted memory, especially when calling this from inside
     // GIFImageReader!
     bool setFailed() override;
 
     // Callbacks from the GIF reader.
     bool haveDecodedRow(size_t frameIndex, GIFRow::const_iterator rowBegin, size_t width, size_t rowNumber, unsigned repeatCount, bool writeTransparentPixels);
     bool frameComplete(size_t frameIndex);
 
-    // For testing.
+    // For testing and metrics.
     bool parseCompleted() const;
+    void setSizeOffset(size_t);
+    void setSizeOffsetOptimized(size_t);
 
 private:
     // ImageDecoder:
     void clearFrameBuffer(size_t frameIndex) override;
     virtual void decodeSize() { parse(GIFSizeQuery); }
     size_t decodeFrameCount() override;
     void initializeNewFrame(size_t) override;
     void decode(size_t) override;
 
     // Parses as much as is needed to answer the query, ignoring bitmap
     // data. If parsing fails, sets the "decode failure" flag.
     void parse(GIFParseQuery);
 
     // Called to initialize the frame buffer with the given index, based on
     // the previous frame's disposal method. Returns true on success. On
     // failure, this will mark the image as failed.
     bool initFrameBuffer(size_t frameIndex);
 
     // Like clearCacheExceptFrame(), but preserves two frames instead of one.
     size_t clearCacheExceptTwoFrames(size_t, size_t);
 
     bool m_currentBufferSawAlpha;
     mutable int m_repetitionCount;
     OwnPtr<GIFImageReader> m_reader;
+    size_t m_sizeOffset;
+    size_t m_sizeOffsetOptimized;
 };
 
 } // namespace blink
 
 #endif