Adding an interface to allow extention of the audio player for CRD and iOS.

remoting/client/audio_player_android.h

 // Copyright 2016 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_CLIENT_AUDIO_PLAYER_ANDROID_H_
 #define REMOTING_CLIENT_AUDIO_PLAYER_ANDROID_H_
 
 #include <SLES/OpenSLES.h>
 #include <SLES/OpenSLES_Android.h>
 
 #include "base/macros.h"
+#include "base/memory/weak_ptr.h"
 #include "remoting/client/audio_player.h"
 
 namespace remoting {
 
 class AudioPlayerAndroid : public AudioPlayer {
  public:
   AudioPlayerAndroid();
   ~AudioPlayerAndroid() override;
 
+  base::WeakPtr<AudioPlayerAndroid> GetWeakPtr();
+
   // AudioPlayer overrides.
   uint32_t GetSamplesPerFrame() override;
   bool ResetAudioPlayer(AudioPacket::SamplingRate sampling_rate) override;
 
  private:
   // Called when new data is needed for the buffer queue.
   static void BufferQueueCallback(SLAndroidSimpleBufferQueueItf caller,
                                   void* args);
   static SLDataFormat_PCM CreatePcmFormat(int sampling_rate);
 
   // Destroys the player and releases the buffer. Do nothing if the player is
   // nullptr.
   void DestroyPlayer();
 
   SLObjectItf engine_object_ = nullptr;
   SLEngineItf engine_ = nullptr;
   SLObjectItf output_mix_object_ = nullptr;
   SLObjectItf player_object_ = nullptr;
   SLPlayItf player_ = nullptr;
   SLAndroidSimpleBufferQueueItf buffer_queue_ = nullptr;
   std::unique_ptr<uint8_t[]> frame_buffer_;
   size_t buffer_size_ = 0;
   uint32_t sample_per_frame_ = 0;
 
+  base::WeakPtrFactory<AudioPlayerAndroid> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(AudioPlayerAndroid);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_CLIENT_AUDIO_PLAYER_ANDROID_H_