Use 2 buffers on presumable good Windows boxes.

media/audio/audio_util.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_AUDIO_AUDIO_UTIL_H_
 #define MEDIA_AUDIO_AUDIO_UTIL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 114 matching lines @@
                                      uint32 shared_memory_size);
 MEDIA_EXPORT bool IsUnknownDataSize(base::SharedMemory* shared_memory,
                                     uint32 shared_memory_size);
 
 #if defined(OS_WIN)
 
 // Does Windows support WASAPI? We are checking in lot of places, and
 // sometimes check was written incorrectly, so move into separate function.
 MEDIA_EXPORT bool IsWASAPISupported();
 
+// Returns number of buffers to be used by wave out.
+MEDIA_EXPORT int NumberOfWaveOutBuffers();
+
 #endif  // defined(OS_WIN)
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_UTIL_H_