Enable passing receive stream ID to the decoder factory.

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 c739096ac5c190671432b3259033ceff11489455..9f91e563fb21da4bbf81a048ae832fdb0d2f156f 100644
--- a/webrtc/media/engine/webrtcvideodecoderfactory.h
+++ b/webrtc/media/engine/webrtcvideodecoderfactory.h
@@ -20,12 +20,20 @@ class VideoDecoder;
 
 namespace cricket {
 
+struct VideoDecoderParams {
+  std::string receive_stream_id;
+};
+
 class WebRtcVideoDecoderFactory {
  public:
   // Caller takes the ownership of the returned object and it should be released
   // by calling DestroyVideoDecoder().
   virtual webrtc::VideoDecoder* CreateVideoDecoder(
       webrtc::VideoCodecType type) = 0;
+  virtual webrtc::VideoDecoder* CreateVideoDecoderWithParams(

[sakal, 2016/06/16 09:33:59]

I had to change the name because otherwise decoders deciding not to implement
this would cause warnings which are treated as errors. Having it with the same
name broke Android build.

+      webrtc::VideoCodecType type, VideoDecoderParams params) {
+    return CreateVideoDecoder(type);
+  }
   virtual ~WebRtcVideoDecoderFactory() {}
 
   virtual void DestroyVideoDecoder(webrtc::VideoDecoder* decoder) = 0;