New jitter buffer experiment.

BUG=webrtc:5514

Review-Url: https://codereview.webrtc.org/2480293002
Cr-Commit-Position: refs/heads/master@{#15077}

webrtc/modules/video_coding/video_coding_impl.h

@@ -143,6 +143,8 @@ class VideoReceiver : public Module {
 
   int32_t Decode(uint16_t maxWaitTimeMs);
 
+  int32_t Decode(const webrtc::VCMEncodedFrame* frame);
+
   int32_t ReceiveCodec(VideoCodec* currentReceiveCodec) const;
   VideoCodecType ReceiveCodec() const;