Add new video codec factories

webrtc/media/engine/webrtcvideodecoderfactory.h

Index: webrtc/media/engine/webrtcvideodecoderfactory.h
diff --git a/webrtc/media/engine/webrtcvideodecoderfactory.h b/webrtc/media/engine/webrtcvideodecoderfactory.h
index d0dc3a500ea8a49d7bcd8c58d867d8adf859ecda..e4d1c984074a7b36cdd4b8f84aad5bc07e46c643 100644
--- a/webrtc/media/engine/webrtcvideodecoderfactory.h
+++ b/webrtc/media/engine/webrtcvideodecoderfactory.h
@@ -25,6 +25,8 @@ struct VideoDecoderParams {
   std::string receive_stream_id;
 };
 
+// Deprecated. Use webrtc::VideoDecoderFactory instead.
+// https://bugs.chromium.org/p/webrtc/issues/detail?id=7925
 class WebRtcVideoDecoderFactory {
  public:
   // Caller takes the ownership of the returned object and it should be released