Refactoring to share MockAudioOutputStream implementations across 3 platforms

media/audio/win/waveout_output_win.cc

 // Copyright (c) 2006-2008 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 <windows.h>
 #include <mmsystem.h>
 #pragma comment(lib, "winmm.lib")
 
 #include "media/audio/win/waveout_output_win.h"
 
@@ skipping 197 matching lines @@
 }
 
 void PCMWaveOutAudioOutputStream::GetVolume(double* left_level,
                                             double* right_level) {
   if (!waveout_)
     return;
   *left_level = volume_;
   *right_level = volume_;
 }
 
-size_t PCMWaveOutAudioOutputStream::GetNumBuffers() {
-  return kNumBuffers;
-}
-
 void PCMWaveOutAudioOutputStream::HandleError(MMRESULT error) {
   DLOG(WARNING) << "PCMWaveOutAudio error " << error;
   callback_->OnError(this, error);
 }
 
 void PCMWaveOutAudioOutputStream::QueueNextPacket(WAVEHDR *buffer) {
   // Call the source which will fill our buffer with pleasant sounds and
   // return to us how many bytes were used.
   // TODO(fbarchard): Handle used 0 by queueing more.
   size_t used = callback_->OnMoreData(this, buffer->lpData, buffer_size_);
@@ skipping 43 matching lines @@
     if (result != MMSYSERR_NOERROR)
       obj->HandleError(result);
 
   } else if (msg == WOM_CLOSE) {
     // We can be closed before calling Start, so it is possible to have a
     // null callback at this point.
     if (obj->callback_)
       obj->callback_->OnClose(obj);
   }
 }