[WIP] Proxy RtcVideoDecoder calls to a media::VideoDecoder.

media/filters/ffmpeg_video_decoder.cc

Index: media/filters/ffmpeg_video_decoder.cc
diff --git a/media/filters/ffmpeg_video_decoder.cc b/media/filters/ffmpeg_video_decoder.cc
index 05849f2dd83eb853f489be1b851e4d29a9a3213a..da9a255fc67c91029ad7a9bcb02616291041b17e 100644
--- a/media/filters/ffmpeg_video_decoder.cc
+++ b/media/filters/ffmpeg_video_decoder.cc
@@ -186,7 +186,7 @@ void FFmpegVideoDecoder::Initialize(const VideoDecoderConfig& config,
                                     const InitCB& init_cb,
                                     const OutputCB& output_cb) {
   DCHECK(thread_checker_.CalledOnValidThread());
-  DCHECK(config.IsValidConfig());
+  DCHECK(config.IsValidConfig()) << config.AsHumanReadableString();
   DCHECK(!output_cb.is_null());
 
   InitCB bound_init_cb = BindToCurrentLoop(init_cb);
@@ -215,6 +215,7 @@ void FFmpegVideoDecoder::Initialize(const VideoDecoderConfig& config,
 
 void FFmpegVideoDecoder::Decode(const scoped_refptr<DecoderBuffer>& buffer,
                                 const DecodeCB& decode_cb) {
+  VLOG(0) << __FUNCTION__;
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(buffer.get());
   DCHECK(!decode_cb.is_null());