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

remoting/client/audio_player_android.h

Index: remoting/client/audio_player_android.h
diff --git a/remoting/client/audio_player_android.h b/remoting/client/audio_player_android.h
index 1c062938910ce609b40b97cb9c4ab239d9acd5af..16059b602df7ba063ac1fdf7e8e9926da9d9ed4a 100644
--- a/remoting/client/audio_player_android.h
+++ b/remoting/client/audio_player_android.h
@@ -9,6 +9,7 @@
 #include <SLES/OpenSLES_Android.h>
 
 #include "base/macros.h"
+#include "base/memory/weak_ptr.h"
 #include "remoting/client/audio_player.h"
 
 namespace remoting {
@@ -18,6 +19,8 @@ class AudioPlayerAndroid : public AudioPlayer {
   AudioPlayerAndroid();
   ~AudioPlayerAndroid() override;
 
+  base::WeakPtr<AudioPlayerAndroid> GetWeakPtr();
+
   // AudioPlayer overrides.
   uint32_t GetSamplesPerFrame() override;
   bool ResetAudioPlayer(AudioPacket::SamplingRate sampling_rate) override;
@@ -42,6 +45,8 @@ class AudioPlayerAndroid : public AudioPlayer {
   size_t buffer_size_ = 0;
   uint32_t sample_per_frame_ = 0;
 
+  base::WeakPtrFactory<AudioPlayerAndroid> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(AudioPlayerAndroid);
 };