Add OSX aggregate audio device support for best performance.

media/audio/mac/audio_auhal_mac.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/mac/audio_auhal_mac.h"
 
 #include <CoreServices/CoreServices.h>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
@@ skipping 58 matching lines @@
       source_(NULL),
       device_(device),
       audio_unit_(0),
       volume_(1),
       hardware_latency_frames_(0),
       stopped_(false),
       input_buffer_list_(NULL) {
   // We must have a manager.
   DCHECK(manager_);
 
-  DVLOG(1) << "Input channels: " << input_channels_;
-  DVLOG(1) << "Output channels: " << output_channels_;
-  DVLOG(1) << "Sample rate: " << params_.sample_rate();
-  DVLOG(1) << "Buffer size: " << number_of_frames_;
+  VLOG(1) << "AUHALStream::AUHALStream()";
+  VLOG(1) << "Device: " << device;
+  VLOG(1) << "Input channels: " << input_channels_;
+  VLOG(1) << "Output channels: " << output_channels_;
+  VLOG(1) << "Sample rate: " << params_.sample_rate();
+  VLOG(1) << "Buffer size: " << number_of_frames_;
 }
 
 AUHALStream::~AUHALStream() {
 }
 
 bool AUHALStream::Open() {
   // Get the total number of input and output channels that the
   // hardware supports.
   int device_input_channels;
   bool got_input_channels = AudioManagerMac::GetDeviceChannels(
@@ skipping 427 matching lines @@
       0,
       &callback,
       sizeof(callback));
   if (result != noErr)
     return false;
 
   return true;
 }
 
 }  // namespace media