Expose flash playback status and volume control to content renderer

content/renderer/pepper/pepper_platform_audio_output.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 CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_AUDIO_OUTPUT_H_
 #define CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_AUDIO_OUTPUT_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 25 matching lines @@
   // The following three methods are all called on main thread.
 
   // Starts the playback. Returns false on error or if called before the
   // stream is created or after the stream is closed.
   bool StartPlayback();
 
   // Stops the playback. Returns false on error or if called before the stream
   // is created or after the stream is closed.
   bool StopPlayback();
 
+  // Sets the volume. Returns false on error or if called before the stream
+  // is created or after the stream is closed.
+  bool SetVolume(double volume);
+
   // Closes the stream. Make sure to call this before the object is
   // destructed.
   void ShutDown();
 
   // media::AudioOutputIPCDelegate implementation.
   void OnStateChanged(media::AudioOutputIPCDelegateState state) override;
   void OnDeviceAuthorized(media::OutputDeviceStatus device_status,
                           const media::AudioParameters& output_params,
                           const std::string& matched_device_id) override;
   void OnStreamCreated(base::SharedMemoryHandle handle,
@@ skipping 11 matching lines @@
 
   bool Initialize(int sample_rate,
                   int frames_per_buffer,
                   int source_render_frame_id,
                   AudioHelper* client);
 
   // I/O thread backends to above functions.
   void InitializeOnIOThread(const media::AudioParameters& params);
   void StartPlaybackOnIOThread();
   void StopPlaybackOnIOThread();
+  void SetVolumeOnIOThread(double volume);
   void ShutDownOnIOThread();
 
   // The client to notify when the stream is created. THIS MUST ONLY BE
   // ACCESSED ON THE MAIN THREAD.
   AudioHelper* client_;
 
   // Used to send/receive IPC. THIS MUST ONLY BE ACCESSED ON THE
   // I/O thread except to send messages and get the message loop.
   std::unique_ptr<media::AudioOutputIPC> ipc_;
 
   scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
   scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(PepperPlatformAudioOutput);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_AUDIO_OUTPUT_H_