Wire up BitrateAllocation to be sent as RTCP TargetBitrate

webrtc/modules/video_coding/video_coding_impl.h

Index: webrtc/modules/video_coding/video_coding_impl.h
diff --git a/webrtc/modules/video_coding/video_coding_impl.h b/webrtc/modules/video_coding/video_coding_impl.h
index f6e53063fb3256768014ba380984959296a7c427..b5d04c4a68246b9655375be0ae71143857112a50 100644
--- a/webrtc/modules/video_coding/video_coding_impl.h
+++ b/webrtc/modules/video_coding/video_coding_impl.h
@@ -35,6 +35,7 @@
 namespace webrtc {
 
 class VideoBitrateAllocator;
+class VideoBitrateAllocationObserver;
 
 namespace vcm {
 
@@ -79,14 +80,23 @@ class VideoSender : public Module {
   int Bitrate(unsigned int* bitrate) const;
   int FrameRate(unsigned int* framerate) const;
 
-  int32_t SetChannelParameters(uint32_t target_bitrate_bps,
-                               uint8_t lossRate,
-                               int64_t rtt,
-                               VideoBitrateAllocator* bitrate_allocator);
-  // Updates the channel parameters, with a reallocated bitrate based on a
-  // presumably updated codec configuration, but does not update the encoder
-  // itself (it will be updated on the next frame).
-  void UpdateChannelParemeters(VideoBitrateAllocator* bitrate_allocator);
+  // Update the channel parameters based on new rates and rtt. This will also
+  // cause an immediate call to VideoEncoder::SetRateAllocation().
+  int32_t SetChannelParameters(
+      uint32_t target_bitrate_bps,
+      uint8_t loss_rate,
+      int64_t rtt,
+      VideoBitrateAllocator* bitrate_allocator,
+      VideoBitrateAllocationObserver* bitrate_updated_callback);
+
+  // Updates the channel parameters with a new bitrate allocation, but using the
+  // current targit_bitrate, loss rate and rtt. That is, the distribution or
+  // caps may be updated to a change to a new VideoCodec or allocation mode.
+  // The new parameters will be stored as pending EncoderParameters, and the
+  // encoder will only be updated on the next frame.
+  void UpdateChannelParemeters(
+      VideoBitrateAllocator* bitrate_allocator,
+      VideoBitrateAllocationObserver* bitrate_updated_callback);
 
   // Deprecated:
   // TODO(perkj): Remove once no projects use it.