Use different RTX payload types for different H264 profiles

webrtc/media/engine/fakewebrtcvideoengine.h

Index: webrtc/media/engine/fakewebrtcvideoengine.h
diff --git a/webrtc/media/engine/fakewebrtcvideoengine.h b/webrtc/media/engine/fakewebrtcvideoengine.h
index 008f7a12d23ceefc3b4b33b70252e5324baa28e2..a3fb30ce1602047828cb5edf63c597d1ca5241f5 100644
--- a/webrtc/media/engine/fakewebrtcvideoengine.h
+++ b/webrtc/media/engine/fakewebrtcvideoengine.h
@@ -233,6 +233,10 @@ class FakeWebRtcVideoEncoderFactory : public WebRtcVideoEncoderFactory {
     encoders_have_internal_sources_ = internal_source;
   }
 
+  void AddSupportedVideoCodec(const cricket::VideoCodec& codec) {
+    codecs_.push_back(codec);
+  }
+
   void AddSupportedVideoCodecType(const std::string& name) {
     codecs_.push_back(cricket::VideoCodec(name));
   }