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
FFmpegVideoDecodeEngine::FFmpegVideoDecodeEngine()
    : codec_context_(NULL),
      event_handler_(NULL),
      frame_rate_numerator_(0),
      frame_rate_denominator_(0),
      pending_input_buffers_(0),
      pending_output_buffers_(0),
      output_eos_reached_(false),
      flush_pending_(false) {
}

FFmpegVideoDecodeEngine::FFmpegVideoDecodeEngine()
    : codec_context_(NULL),
      event_handler_(NULL),
      frame_rate_numerator_(0),
      frame_rate_denominator_(0),
      pending_input_buffers_(0),
      pending_output_buffers_(0),
      output_eos_reached_(false),
      flush_pending_(false) {
}
