Adapt encoder behavior to target bitrate

remoting/protocol/webrtc_video_encoder.h

Index: remoting/protocol/webrtc_video_encoder.h
diff --git a/remoting/protocol/webrtc_video_encoder.h b/remoting/protocol/webrtc_video_encoder.h
index 0a32957d2de200171166e4c0ddf4d5214d7def8a..84c850cc78902b5e9ba6be42c54b897fb6edf104 100644
--- a/remoting/protocol/webrtc_video_encoder.h
+++ b/remoting/protocol/webrtc_video_encoder.h
@@ -16,6 +16,8 @@
 
 namespace remoting {
 
+using TargetBitrateCallback = base::Callback<void(uint32_t)>;
+
 // This is the interface between the WebRtc engine and the external encoder
 // provided by remoting. WebRtc provides feedback on network bandwidth, latency
 // & RTT and in turn remoting passes encoded frames as they get encoded
@@ -42,16 +44,18 @@ class WebRtcVideoEncoder : public webrtc::VideoEncoder {
   int SendEncodedFrame(int64_t capture_timestamp_ms,
                        std::unique_ptr<VideoPacket> pkt);
   void SetKeyFrameRequestCallback(const base::Closure& key_frame_request);
+  void SetTargetBitrateCallback(const TargetBitrateCallback& target_bitrate_cb);
 
  private:
-  // Protects |encoded_callback_|, |key_frame_request_| and |state_|.
+  // Protects |encoded_callback_|, |key_frame_request_|,
+  // |target_bitrate_cb_| and |state_|.
   base::Lock lock_;
   State state_;
   webrtc::EncodedImageCallback* encoded_callback_;
 
   base::Closure key_frame_request_;
+  TargetBitrateCallback target_bitrate_cb_;
   webrtc::VideoCodecType video_codec_type_;
-  uint32_t target_bitrate_;
 };
 
 // This is the external encoder factory implementation that is passed to
@@ -75,11 +79,13 @@ class WebRtcVideoEncoderFactory : public cricket::WebRtcVideoEncoderFactory {
                        std::unique_ptr<VideoPacket> pkt);
 
   void SetKeyFrameRequestCallback(const base::Closure& key_frame_request);
+  void SetTargetBitrateCallback(const TargetBitrateCallback& target_bitrate_cb);
 
  private:
-  // Protects |key_frame_request_|.
+  // Protects |key_frame_request_| and |target_bitrate_cb_|.
   base::Lock lock_;
   base::Closure key_frame_request_;
+  TargetBitrateCallback target_bitrate_cb_;
   std::vector<cricket::WebRtcVideoEncoderFactory::VideoCodec> codecs_;
   std::vector<std::unique_ptr<WebRtcVideoEncoder>> encoders_;
 };