Move direct use of VideoCapturer::VideoAdapter to VideoSinkWants.

webrtc/media/engine/webrtcvideoengine2.h

Index: webrtc/media/engine/webrtcvideoengine2.h
diff --git a/webrtc/media/engine/webrtcvideoengine2.h b/webrtc/media/engine/webrtcvideoengine2.h
index 16b7cc51577f306433e353df2565a1e700459a13..928a14ade38c511f1e3dba15bd249e5788aaceab 100644
--- a/webrtc/media/engine/webrtcvideoengine2.h
+++ b/webrtc/media/engine/webrtcvideoengine2.h
@@ -129,9 +129,7 @@ class WebRtcVideoEngine2 {
   rtc::scoped_ptr<WebRtcVideoEncoderFactory> simulcast_encoder_factory_;
 };
 
-class WebRtcVideoChannel2 : public VideoMediaChannel,
-                            public webrtc::Transport,
-                            public webrtc::LoadObserver {
+class WebRtcVideoChannel2 : public VideoMediaChannel, public webrtc::Transport {
  public:
   WebRtcVideoChannel2(webrtc::Call* call,
                       const MediaConfig& config,
@@ -168,8 +166,6 @@ class WebRtcVideoChannel2 : public VideoMediaChannel,
   void OnReadyToSend(bool ready) override;
   void SetInterface(NetworkInterface* iface) override;
 
-  void OnLoadUpdate(Load load) override;
-
   // Implemented for VideoMediaChannelTest.
   bool sending() const { return sending_; }
   uint32_t GetDefaultSendChannelSsrc() { return default_send_ssrc_; }
@@ -229,7 +225,8 @@ class WebRtcVideoChannel2 : public VideoMediaChannel,
   // Wrapper for the sender part, this is where the capturer is connected and
   // frames are then converted from cricket frames to webrtc frames.
   class WebRtcVideoSendStream
-      : public rtc::VideoSinkInterface<cricket::VideoFrame> {
+      : public rtc::VideoSinkInterface<cricket::VideoFrame>,
+        public webrtc::LoadObserver {
    public:
     WebRtcVideoSendStream(
         webrtc::Call* call,
@@ -237,6 +234,7 @@ class WebRtcVideoChannel2 : public VideoMediaChannel,
         const webrtc::VideoSendStream::Config& config,
         WebRtcVideoEncoderFactory* external_encoder_factory,
         const VideoOptions& options,
+        bool enable_cpu_overuse_detection,
         int max_bitrate_bps,
         const rtc::Optional<VideoCodecSettings>& codec_settings,
         const std::vector<webrtc::RtpExtension>& rtp_extensions,
@@ -255,6 +253,9 @@ class WebRtcVideoChannel2 : public VideoMediaChannel,
     void Start();
     void Stop();
 
+    // Implements webrtc::LoadObserver.
+    void OnLoadUpdate(Load load) override;
+
     const std::vector<uint32_t>& GetSsrcs() const;
     VideoSenderInfo GetVideoSenderInfo();
     void FillBandwidthEstimationInfo(BandwidthEstimationInfo* bwe_info);
@@ -340,10 +341,14 @@ class WebRtcVideoChannel2 : public VideoMediaChannel,
     void SetDimensions(int width, int height, bool is_screencast)
         EXCLUSIVE_LOCKS_REQUIRED(lock_);
 
+    rtc::ThreadChecker thread_checker_;
     const std::vector<uint32_t> ssrcs_;
     const std::vector<SsrcGroup> ssrc_groups_;
     webrtc::Call* const call_;
     rtc::VideoSinkWants sink_wants_;
+    class LoadObserverProxy;
+    rtc::scoped_ptr<LoadObserverProxy> load_proxy_;
+    size_t cpu_downgrade_count_ = 0;
     WebRtcVideoEncoderFactory* const external_encoder_factory_
         GUARDED_BY(lock_);