Remove completion callbacks from AudioRenderer::Play/Pause().

media/base/audio_renderer.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 MEDIA_BASE_AUDIO_RENDERER_H_
 #define MEDIA_BASE_AUDIO_RENDERER_H_
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/time/time.h"
@@ skipping 29 matching lines @@
   //
   // |error_cb| is executed if an error was encountered.
   virtual void Initialize(DemuxerStream* stream,
                           const PipelineStatusCB& init_cb,
                           const StatisticsCB& statistics_cb,
                           const base::Closure& underflow_cb,
                           const TimeCB& time_cb,
                           const base::Closure& ended_cb,
                           const PipelineStatusCB& error_cb) = 0;
 
-  // Start audio decoding and rendering at the current playback rate, executing
-  // |callback| when playback is underway.
-  virtual void Play(const base::Closure& callback) = 0;
+  // Signal audio playback to start at the current rate. It is expected that
+  // |time_cb| will eventually start being run with time updates.
+  virtual void Play() = 0;
 
-  // Temporarily suspend decoding and rendering audio, executing |callback| when
-  // playback has been suspended.
-  virtual void Pause(const base::Closure& callback) = 0;
+  // Signal audio playback to stop until further notice. It is expected that
+  // |time_cb| will no longer be run.
+  virtual void Pause() = 0;
 
   // Discard any audio data, executing |callback| when completed.
   virtual void Flush(const base::Closure& callback) = 0;
 
   // Start prerolling audio data for samples starting at |time|, executing
   // |callback| when completed.
   //
   // Only valid to call after a successful Initialize() or Flush().
   virtual void Preroll(base::TimeDelta time,
                        const PipelineStatusCB& callback) = 0;
@@ skipping 11 matching lines @@
   // Resumes playback after underflow occurs.
   virtual void ResumeAfterUnderflow() = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AudioRenderer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_AUDIO_RENDERER_H_