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

remoting/client/audio_consumer.h

Index: remoting/client/audio_consumer.h
diff --git a/remoting/client/audio_consumer.h b/remoting/client/audio_consumer.h
new file mode 100644
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+++ b/remoting/client/audio_consumer.h
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+// Copyright (c) 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_CONSUMER_H_
+#define REMOTING_CLIENT_AUDIO_CONSUMER_H_
+
+#include <memory>
+
+#include "remoting/proto/audio.pb.h"
+
+namespace remoting {
+
+class AudioConsumer {
+ public:
+  virtual ~AudioConsumer();
+  virtual void AddAudioPacket(std::unique_ptr<AudioPacket> packet) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(AudioConsumer);
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_CLIENT_AUDIO_CONSUMER_H_