Make LoadObserver settable per video send stream. Gives client flexibility and makes the implementa…

webrtc/video_send_stream.h

Index: webrtc/video_send_stream.h
diff --git a/webrtc/video_send_stream.h b/webrtc/video_send_stream.h
index bc8773e70910030afa8cfb848cac749f0d525b61..5d84aaddde3d561ac79038e6956c358f1394d66f 100644
--- a/webrtc/video_send_stream.h
+++ b/webrtc/video_send_stream.h
@@ -23,6 +23,7 @@
 
 namespace webrtc {
 
+class LoadObserver;
 class VideoEncoder;
 
 // Class to deliver captured frame to the video send stream.
@@ -118,6 +119,10 @@ class VideoSendStream : public SendStream {
     // Transport for outgoing packets.
     newapi::Transport* send_transport = nullptr;
 
+    // Callback for overuse and normal usage based on the jitter of incoming
+    // captured frames. 'nullptr' disables the callback.
+    LoadObserver* overuse_callback = nullptr;
+
     // Called for each I420 frame before encoding the frame. Can be used for
     // effects, snapshots etc. 'nullptr' disables the callback.
     I420FrameCallback* pre_encode_callback = nullptr;