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

remoting/client/audio_decode_scheduler.h

 // Copyright (c) 2012 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_DECODE_SCHEDULER_H_
 #define REMOTING_CLIENT_AUDIO_DECODE_SCHEDULER_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "remoting/protocol/audio_stub.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }  // namespace base
 
 namespace remoting {
 
 namespace protocol {
 class SessionConfig;
 }  // namespace protocol
 
+class AudioConsumer;
 class AudioDecoder;
 class AudioPacket;
-class AudioConsumer;
 
 class AudioDecodeScheduler : public protocol::AudioStub {
  public:
   AudioDecodeScheduler(
       scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> audio_decode_task_runner,
       base::WeakPtr<AudioConsumer> audio_consumer);
   ~AudioDecodeScheduler() override;
 
   // Initializes decoder with the information from the protocol config.
   void Initialize(const protocol::SessionConfig& config);
 
   // AudioStub implementation.
   void ProcessAudioPacket(std::unique_ptr<AudioPacket> packet,
                           const base::Closure& done) override;
 
  private:
   class Core;
 
   scoped_refptr<Core> core_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioDecodeScheduler);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_CLIENT_AUDIO_DECODE_SCHEDULER_H_