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

remoting/client/audio_player.h

Index: remoting/client/audio_player.h
diff --git a/remoting/client/audio_player.h b/remoting/client/audio_player.h
index ea0b789d75c5b20b7b5c7947446865a59d90178b..003f8d8bc6451e9238a3a812db73746ead4badff 100644
--- a/remoting/client/audio_player.h
+++ b/remoting/client/audio_player.h
@@ -13,21 +13,25 @@
 
 #include "base/macros.h"
 #include "base/synchronization/lock.h"
+#include "remoting/client/audio_consumer.h"
 #include "remoting/proto/audio.pb.h"
 
 namespace remoting {
 
-class AudioPlayer {
+class AudioPlayer : public AudioConsumer {
  public:
   // The number of channels in the audio stream (only supporting stereo audio
   // for now).
   static const int kChannels = 2;
   static const int kSampleSizeBytes = 2;
 
-  virtual ~AudioPlayer();
+  ~AudioPlayer() override;
 
   void ProcessAudioPacket(std::unique_ptr<AudioPacket> packet);
 
+  // AudioConsumer implementation.
+  void AddAudioPacket(std::unique_ptr<AudioPacket> packet) override;
+
  protected:
   AudioPlayer();