Fix AudioPump to pause the stream when the network is congested.

remoting/host/audio_pump.h

 // Copyright 2015 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.
 
 #ifndef REMOTING_HOST_AUDIO_PUMP_H_
 #define REMOTING_HOST_AUDIO_PUMP_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 14 matching lines @@
 class AudioPacket;
 
 // AudioPump is responsible for fetching audio data from the AudioCapturer
 // and encoding it before passing it to the AudioStub for delivery to the
 // client. Audio is captured and encoded on the audio thread and then passed to
 // AudioStub on the network thread.
 class AudioPump {
  public:
   // The caller must ensure that the |audio_stub| is not destroyed until the
   // pump is destroyed.
-  AudioPump(
-      scoped_refptr<base::SingleThreadTaskRunner> audio_task_runner,
-      scoped_ptr<AudioCapturer> audio_capturer,
-      scoped_ptr<AudioEncoder> audio_encoder,
-      protocol::AudioStub* audio_stub);
+  AudioPump(scoped_refptr<base::SingleThreadTaskRunner> audio_task_runner,
+            scoped_ptr<AudioCapturer> audio_capturer,
+            scoped_ptr<AudioEncoder> audio_encoder,
+            protocol::AudioStub* audio_stub);
   virtual ~AudioPump();
 
   // Pauses or resumes audio on a running session. This leaves the audio
   // capturer running, and only affects whether or not the captured audio is
   // encoded and sent on the wire.
   void Pause(bool pause);
 
  private:
   class Core;
 
   // Called on the network thread to send a captured packet to the audio stub.
-  void SendAudioPacket(scoped_ptr<AudioPacket> packet);
+  void SendAudioPacket(scoped_ptr<AudioPacket> packet, int size);
+
+  // Callback for BufferedSocketWriter.
+  void OnPacketSent(int size);
 
   base::ThreadChecker thread_checker_;
 
   scoped_refptr<base::SingleThreadTaskRunner> audio_task_runner_;
   protocol::AudioStub* audio_stub_;
 
   scoped_ptr<Core> core_;
 
   base::WeakPtrFactory<AudioPump> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioPump);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_AUDIO_PUMP_H_