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

remoting/client/audio_decode_scheduler.h

Index: remoting/client/audio_decode_scheduler.h
diff --git a/remoting/client/audio_decode_scheduler.h b/remoting/client/audio_decode_scheduler.h
index 767342f011edf79ddb37bc5303367846a957cef1..af9fa34d8abd502a5847e77315c7032f3c5c5806 100644
--- a/remoting/client/audio_decode_scheduler.h
+++ b/remoting/client/audio_decode_scheduler.h
@@ -9,6 +9,7 @@
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
 #include "remoting/protocol/audio_stub.h"
 
 namespace base {
@@ -21,16 +22,16 @@ namespace protocol {
 class SessionConfig;
 }  // namespace protocol
 
+class AudioConsumer;
 class AudioDecoder;
 class AudioPacket;
-class AudioPlayer;
 
 class AudioDecodeScheduler : public protocol::AudioStub {
  public:
   AudioDecodeScheduler(
       scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> audio_decode_task_runner,
-      std::unique_ptr<AudioPlayer> audio_player);
+      base::WeakPtr<AudioConsumer> audio_consumer);
   ~AudioDecodeScheduler() override;
 
   // Initializes decoder with the information from the protocol config.