Add OSX aggregate audio device support for best performance.

media/audio/mac/audio_synchronized_mac.cc

 // 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.
 
 #include "media/audio/mac/audio_synchronized_mac.h"
 
 #include <CoreServices/CoreServices.h>
 #include <algorithm>
 
 #include "base/basictypes.h"
@@ skipping 67 matching lines @@
       target_fifo_frames_(kBaseTargetFifoFrames),
       average_delta_(0.0),
       fifo_rate_compensation_(1.0),
       input_unit_(0),
       varispeed_unit_(0),
       output_unit_(0),
       first_input_time_(-1),
       is_running_(false),
       hardware_buffer_size_(kHardwareBufferSize),
       channels_(kChannels) {
+  VLOG(1) << "AudioSynchronizedStream::AudioSynchronizedStream()";
 }
 
 AudioSynchronizedStream::~AudioSynchronizedStream() {
   DCHECK(!input_unit_);
   DCHECK(!output_unit_);
   DCHECK(!varispeed_unit_);
 }
 
 bool AudioSynchronizedStream::Open() {
   if (params_.channels() != kChannels) {
@@ skipping 838 matching lines @@
       &pa,
       0,
       0,
       &property_size,
       &buffer_size_frames_);
 
   OSSTATUS_DCHECK(result == noErr, result);
 }
 
 }  // namespace media