Don't forget the ffmpeg input buffer padding when allocating a codec's
extradata buffer.

BUG=82438
Review URL: http://codereview.chromium.org/7137002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@88354 0039d316-1c4b-4281-b951-d872f2087c98
void FFmpegVideoDecodeEngine::Flush() {
  avcodec_flush_buffers(codec_context_);
  flush_pending_ = true;
  TryToFinishPendingFlush();
}

void FFmpegVideoDecodeEngine::Flush() {
  avcodec_flush_buffers(codec_context_);
  flush_pending_ = true;
  TryToFinishPendingFlush();
}
