Add remoting::protocol::NetworkStateObserver interface.

remoting/protocol/webrtc_frame_scheduler_simple.h

Index: remoting/protocol/webrtc_frame_scheduler_simple.h
diff --git a/remoting/protocol/webrtc_frame_scheduler_simple.h b/remoting/protocol/webrtc_frame_scheduler_simple.h
index 86c54273f72398841eee2e94013ddf58996794b2..6a38b39dd1bab9f6f5778c5778ccd3b70b04d566 100644
--- a/remoting/protocol/webrtc_frame_scheduler_simple.h
+++ b/remoting/protocol/webrtc_frame_scheduler_simple.h
@@ -7,9 +7,11 @@
 
 #include "remoting/protocol/webrtc_frame_scheduler.h"
 
+#include "base/threading/thread_checker.h"
 #include "base/timer/timer.h"
 #include "remoting/base/leaky_bucket.h"
 #include "remoting/base/running_samples.h"
+#include "remoting/protocol/video_channel_state_observer.h"
 
 namespace remoting {
 namespace protocol {
@@ -17,16 +19,21 @@ namespace protocol {
 // WebrtcFrameSchedulerSimple is a simple implementation of
 // WebrtcFrameScheduler that always keeps only one frame in the pipeline.
 // It schedules each frame after the previous one is expected to finish sending.
-class WebrtcFrameSchedulerSimple : public WebrtcFrameScheduler {
+class WebrtcFrameSchedulerSimple : public VideoChannelStateObserver,
+                                   public WebrtcFrameScheduler {
  public:
   WebrtcFrameSchedulerSimple();
   ~WebrtcFrameSchedulerSimple() override;
 
+  // VideoChannelStateObserver implementation.
+  void OnKeyFrameRequested() override;
+  void OnChannelParameters(int packet_loss, base::TimeDelta rtt) override;
+  void OnTargetBitrateChanged(int bitrate_kbps) override;
+
   // WebrtcFrameScheduler implementation.
-  void Start(const base::Closure& capture_callback) override;
+  void Start(WebrtcDummyVideoEncoderFactory* video_encoder_factory,
+             const base::Closure& capture_callback) override;
   void Pause(bool pause) override;
-  void SetKeyFrameRequest() override;
-  void SetTargetBitrate(int bitrate_kbps) override;
   bool GetEncoderFrameParams(
       const webrtc::DesktopFrame& frame,
       WebrtcVideoEncoder::FrameParams* params_out) override;
@@ -56,6 +63,9 @@ class WebrtcFrameSchedulerSimple : public WebrtcFrameScheduler {
   RunningSamples updated_region_area_;
 
   base::OneShotTimer capture_timer_;
+
+  base::ThreadChecker thread_checker_;
+  base::WeakPtrFactory<WebrtcFrameSchedulerSimple> weak_factory_;
 };
 
 }  // namespace protocol