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

remoting/codec/audio_encoder_opus.h

 // Copyright (c) 2012 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_CODEC_AUDIO_ENCODER_OPUS_H_
 #define REMOTING_CODEC_AUDIO_ENCODER_OPUS_H_
 
 #include "remoting/codec/audio_encoder.h"
 
 #include "remoting/proto/audio.pb.h"
 
 struct OpusEncoder;
 
 namespace media {
 class AudioBus;
 class MultiChannelResampler;
 }  // namespace media
 
 namespace remoting {
 
 class AudioPacket;
 
 class AudioEncoderOpus : public AudioEncoder {
  public:
   AudioEncoderOpus();
   ~AudioEncoderOpus() override;
 
   // AudioEncoder interface.
   scoped_ptr<AudioPacket> Encode(scoped_ptr<AudioPacket> packet) override;
+  int GetBitrate() override;
 
  private:
   void InitEncoder();
   void DestroyEncoder();
   bool ResetForPacket(AudioPacket* packet);
 
   void FetchBytesToResample(int resampler_frame_delay,
                             media::AudioBus* audio_bus);
 
   int sampling_rate_;
@@ skipping 14 matching lines @@
   scoped_ptr<int16[]> leftover_buffer_;
   int leftover_buffer_size_;
   int leftover_samples_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioEncoderOpus);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_CODEC_AUDIO_ENCODER_OPUS_H_