Adding GetAudioInputDeviceNames to AudioManager, this function is supposed to do device enumerati...

media/audio/mac/audio_manager_mac.cc

Index: media/audio/mac/audio_manager_mac.cc
===================================================================
--- media/audio/mac/audio_manager_mac.cc	(revision 86276)
+++ media/audio/mac/audio_manager_mac.cc	(working copy)
@@ -4,6 +4,7 @@
 
 #include <CoreAudio/AudioHardware.h>
 
+#include "base/stringprintf.h"
 #include "base/sys_info.h"
 #include "media/audio/fake_audio_input_stream.h"
 #include "media/audio/fake_audio_output_stream.h"
@@ -127,6 +128,21 @@
   // TODO(cpu): implement.
 }
 
+void AudioManagerMac::GetAudioInputDeviceNames(
+    AudioDeviceNames* device_names) {
+  // TODO(xians): query a full list of valid devices.
+  if (HasAudioInputDevices()) {
+    // Add the default device to the list.
+    // We use (device_name)_(index) to make up the unique_ids to identify the
+    // devices. For default device, the index is 0, so its unique_id is
+    // Default_0.
+    AudioDeviceName name;
+    name.device_name = AudioManagerBase::kDefaultDeviceName;
+    name.unique_id = StringPrintf("%s_0", AudioManagerBase::kDefaultDeviceName);
+    device_names->push_back(name);
+  }
+}
+
 // Called by the stream when it has been released by calling Close().
 void AudioManagerMac::ReleaseOutputStream(AudioOutputStream* stream) {
   DCHECK(stream);