Add config change support to FFmpegVideoDecoder

media/filters/ffmpeg_video_decoder.h

Index: media/filters/ffmpeg_video_decoder.h
diff --git a/media/filters/ffmpeg_video_decoder.h b/media/filters/ffmpeg_video_decoder.h
index 9302929137a0faf9b0090dc9d736643235c070c1..271cab27338c3be0cdc8ac68593395cf9a093fbf 100644
--- a/media/filters/ffmpeg_video_decoder.h
+++ b/media/filters/ffmpeg_video_decoder.h
@@ -72,6 +72,10 @@ class MEDIA_EXPORT FFmpegVideoDecoder : public VideoDecoder {
   // Delivers the frame to |read_cb_| and resets the callback.
   void DeliverFrame(const scoped_refptr<VideoFrame>& video_frame);
 
+  // Allocate resources for |codec_context_| and |av_frame_| based
+  // on the information in |config|.
+  bool AllocateFFmpegResources(const VideoDecoderConfig& config);
+
   // Releases resources associated with |codec_context_| and |av_frame_|
   // and resets them to NULL.
   void ReleaseFFmpegResources();
@@ -79,6 +83,11 @@ class MEDIA_EXPORT FFmpegVideoDecoder : public VideoDecoder {
   // Reset decoder and call |reset_cb_|.
   void DoReset();
 
+  // Handles fetching a new config from the demuxer stream and
+  // reinitializing the decoder. Returns true if the config change
+  // was successful. Returns false if an error occured.
+  bool HandleConfigChange();
+
   // This is !is_null() iff Initialize() hasn't been called.
   base::Callback<MessageLoop*()> message_loop_factory_cb_;