Fix the issue of undefined-shift in VP8GetBit.

webrtc/modules/video_coding/utility/vp8_header_parser.h

 /*
  *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 17 matching lines @@
 typedef struct VP8BitReader VP8BitReader;
 struct VP8BitReader {
   // Boolean decoder.
   uint32_t value_;  // Current value.
   uint32_t range_;  // Current range minus 1. In [127, 254] interval.
   int bits_;        // Number of valid bits left.
   // Read buffer.
   const uint8_t* buf_;      // Next byte to be read.
   const uint8_t* buf_end_;  // End of read buffer.
   int eof_;                 // True if input is exhausted.
+  bool error_;              // True if input stream contains an error.
 };
 
 const uint8_t kVP8Log2Range[128] = {
     7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3,
     3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
     2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1,
     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0};
 
@@ skipping 11 matching lines @@
 
 // Gets the QP, QP range: [0, 127].
 // Returns true on success, false otherwise.
 bool GetQp(const uint8_t* buf, size_t length, int* qp);
 
 }  // namespace vp8
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_VIDEO_CODING_UTILITY_VP8_HEADER_PARSER_H_