[Cast] Clean-up: Move max_unacked_frames into CongestionControl.

media/cast/sender/frame_sender.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/cast/sender/frame_sender.h"
 
 #include "base/debug/trace_event.h"
 
 namespace media {
 namespace cast {
@@ skipping 88 matching lines @@
     ScheduleNextRtcpReport();
 }
 
 void FrameSender::OnMeasuredRoundTripTime(base::TimeDelta rtt) {
   DCHECK(rtt > base::TimeDelta());
   current_round_trip_time_ = rtt;
 }
 
 void FrameSender::SetTargetPlayoutDelay(
     base::TimeDelta new_target_playout_delay) {
+  if (send_target_playout_delay_ &&
+      target_playout_delay_ == new_target_playout_delay) {
+    return;
+  }
   new_target_playout_delay = std::max(new_target_playout_delay,
                                       min_playout_delay_);
   new_target_playout_delay = std::min(new_target_playout_delay,
                                       max_playout_delay_);
+  VLOG(2) << SENDER_SSRC << "Target playout delay changing from "
+          << target_playout_delay_.InMilliseconds() << " ms to "
+          << new_target_playout_delay.InMilliseconds() << " ms.";
   target_playout_delay_ = new_target_playout_delay;
-  max_unacked_frames_ =
-      std::min(kMaxUnackedFrames,
-               1 + static_cast<int>(target_playout_delay_ *
-                                    max_frame_rate_ /
-                                    base::TimeDelta::FromSeconds(1)));
   send_target_playout_delay_ = true;
+  congestion_control_->UpdateTargetPlayoutDelay(target_playout_delay_);
 }
 
 void FrameSender::ResendCheck() {
   DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
   DCHECK(!last_send_time_.is_null());
   const base::TimeDelta time_since_last_send =
       cast_environment_->Clock()->NowTicks() - last_send_time_;
   if (time_since_last_send > target_playout_delay_) {
     if (latest_acked_frame_id_ == last_sent_frame_id_) {
       // Last frame acked, no point in doing anything
@@ skipping 243 matching lines @@
     VLOG(1) << SENDER_SSRC << "Dropping: In-flight duration would be too high.";
     return true;
   }
 
   // Next frame is accepted.
   return false;
 }
 
 }  // namespace cast
 }  // namespace media