Revert 290359 "Remove AudioBuffersState class."

trunk/src/media/audio/sounds/audio_stream_handler.cc

 // Copyright 2013 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.
 
 #include "media/audio/sounds/audio_stream_handler.h"
 
 #include <string>
 
 #include "base/cancelable_callback.h"
 #include "base/logging.h"
@@ skipping 87 matching lines @@
     if (stream_)
       stream_->Close();
     stream_ = NULL;
     stop_closure_.Cancel();
   }
 
  private:
   // AudioOutputStream::AudioSourceCallback overrides:
   // Following methods could be called from *ANY* thread.
   virtual int OnMoreData(AudioBus* dest,
-                         int /* total_bytes_delay */) OVERRIDE {
+                         AudioBuffersState /* state */) OVERRIDE {
     base::AutoLock al(state_lock_);
     size_t bytes_written = 0;
 
     if (wav_audio_.AtEnd(cursor_) ||
         !wav_audio_.CopyTo(dest, cursor_, &bytes_written)) {
       if (delayed_stop_posted_)
         return 0;
       delayed_stop_posted_ = true;
       AudioManager::Get()->GetTaskRunner()->PostDelayedTask(
           FROM_HERE,
@@ skipping 91 matching lines @@
   g_observer_for_testing = observer;
 }
 
 // static
 void AudioStreamHandler::SetAudioSourceForTesting(
     AudioOutputStream::AudioSourceCallback* source) {
   g_audio_source_for_testing = source;
 }
 
 }  // namespace media