Update RendererWebKitPlatformSupportImpl::createAudioDevice() to handle |input_channels|

media/audio/mac/audio_manager_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_manager_mac.h"
 
 #include <CoreAudio/AudioHardware.h>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 320 matching lines @@
     const AudioParameters& params) {
   DCHECK_EQ(AudioParameters::AUDIO_PCM_LINEAR, params.format());
   return new PCMQueueOutAudioOutputStream(this, params);
 }
 
 AudioOutputStream* AudioManagerMac::MakeLowLatencyOutputStream(
     const AudioParameters& params) {
   DCHECK_EQ(AudioParameters::AUDIO_PCM_LOW_LATENCY, params.format());
 
   // TODO(crogers): remove once we properly handle input device selection.
+  // https://code.google.com/p/chromium/issues/detail?id=147327
   if (CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kEnableWebAudioInput)) {
     if (HasUnifiedDefaultIO())
       return new AudioHardwareUnifiedStream(this, params);
 
     // kAudioDeviceUnknown translates to "use default" here.
     return new AudioSynchronizedStream(this,
                                        params,
                                        kAudioDeviceUnknown,
                                        kAudioDeviceUnknown);
@@ skipping 46 matching lines @@
       GetMessageLoop(), base::Bind(
           &AudioManagerMac::NotifyAllOutputDeviceChangeListeners,
           base::Unretained(this))));
 }
 
 AudioManager* CreateAudioManager() {
   return new AudioManagerMac();
 }
 
 }  // namespace media