Add remoting::protocol::NetworkStateObserver interface.

remoting/protocol/webrtc_frame_scheduler.h

Index: remoting/protocol/webrtc_frame_scheduler.h
diff --git a/remoting/protocol/webrtc_frame_scheduler.h b/remoting/protocol/webrtc_frame_scheduler.h
index 3a26b92b2974e72208b5b43b3da237e67821add5..77125dbbcd460116b2636c846c837c1d053ce85f 100644
--- a/remoting/protocol/webrtc_frame_scheduler.h
+++ b/remoting/protocol/webrtc_frame_scheduler.h
@@ -6,12 +6,15 @@
 #define REMOTING_PROTOCOL_WEBRTC_FRAME_SCHEDULER_H_
 
 #include "base/callback_forward.h"
+#include "base/memory/weak_ptr.h"
 #include "remoting/codec/webrtc_video_encoder.h"
 #include "third_party/webrtc/video_encoder.h"
 
 namespace remoting {
 namespace protocol {
 
+class NetworkStateObserver;
+
 // An abstract interface for frame schedulers, which are responsible for
 // scheduling when video frames are captured and for defining encoding
 // parameters for each frame.
@@ -24,15 +27,11 @@ class WebrtcFrameScheduler {
   // frame should be captured.
   virtual void Start(const base::Closure& capture_callback) = 0;
 
+  virtual base::WeakPtr<NetworkStateObserver> GetNetworkStateObserver() = 0;
+
   // Pause and resumes the scheduler.
   virtual void Pause(bool pause) = 0;
 
-  // Requests a key frame.
-  virtual void SetKeyFrameRequest() = 0;
-
-  // Sets network bitrate estimate.
-  virtual void SetTargetBitrate(int bitrate_kbps) = 0;
-
   // Called after |frame| has been captured to get encoding parameters for the
   // frame. Returns false if the frame should be dropped (e.g. when there are
   // no changed), true otherwise.