Fix Issue 160529 in a nice way

media/base/mock_ffmpeg.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/base/mock_ffmpeg.h"
 
 #include "base/logging.h"
 #include "media/filters/ffmpeg_common.h"
 
 using ::testing::_;
@@ skipping 59 matching lines @@
 
 // static
 void MockFFmpeg::DestructPacket(AVPacket* packet) {
   delete [] packet->data;
   packet->data = NULL;
   packet->size = 0;
 }
 
 // FFmpeg stubs that delegate to the FFmpegMock instance.
 extern "C" {
-
 void avcodec_init() {
   media::MockFFmpeg::get()->AVCodecInit();
 }
 
 int av_register_protocol(URLProtocol* protocol) {
   return media::MockFFmpeg::get()->AVRegisterProtocol(protocol);
 }
 
 void av_register_all() {
   media::MockFFmpeg::get()->AVRegisterAll();
@@ skipping 76 matching lines @@
 }
 
 void av_free(void* ptr) {
   // Freeing NULL pointers are valid, but they aren't interesting from a mock
   // perspective.
   if (ptr) {
     media::MockFFmpeg::get()->AVFree(ptr);
   }
 }
 
+int av_dup_packet(AVPacket* packet) {
+  return media::MockFFmpeg::get()->AVDupPacket(packet);
+}
 }  // extern "C"
 
 }  // namespace media