Fix handling of broken GIFs with weird frame sizes

Source/platform/image-decoders/gif/GIFImageReader.h

 /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* ***** BEGIN LICENSE BLOCK *****
  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  *
  * The contents of this file are subject to the Mozilla Public License Version
  * 1.1 (the "License"); you may not use this file except in compliance with
  * the License. You may obtain a copy of the License at
  * http://www.mozilla.org/MPL/
  *
  * Software distributed under the License is distributed on an "AS IS" basis,
@@ skipping 268 matching lines @@
     WTF_MAKE_FAST_ALLOCATED; WTF_MAKE_NONCOPYABLE(GIFImageReader);
 public:
     GIFImageReader(blink::GIFImageDecoder* client = 0)
         : m_client(client)
         , m_state(GIFType)
         , m_bytesToConsume(6) // Number of bytes for GIF type, either "GIF87a" or "GIF89a".
         , m_bytesRead(0)
         , m_version(0)
         , m_screenWidth(0)
         , m_screenHeight(0)
+        , m_sentSizeToClient(false)
         , m_loopCount(cLoopCountNotSeen)
         , m_parseCompleted(false)
     {
     }
 
     ~GIFImageReader()
     {
     }
 
     void setData(PassRefPtr<blink::SharedBuffer> data) { m_data = data; }
@@ skipping 45 matching lines @@
 
     // Parsing state machine.
     GIFState m_state; // Current decoder master state.
     size_t m_bytesToConsume; // Number of bytes to consume for next stage of parsing.
     size_t m_bytesRead; // Number of bytes processed.
 
     // Global (multi-image) state.
     int m_version; // Either 89 for GIF89 or 87 for GIF87.
     unsigned m_screenWidth; // Logical screen width & height.
     unsigned m_screenHeight;
+    bool m_sentSizeToClient;
     GIFColorMap m_globalColorMap;
     int m_loopCount; // Netscape specific extension block to control the number of animation loops a GIF renders.
 
     Vector<OwnPtr<GIFFrameContext> > m_frames;
 
     RefPtr<blink::SharedBuffer> m_data;
     bool m_parseCompleted;
 };
 
 #endif