Link things together and enable the device selection for linux and mac.

media/audio/mac/audio_low_latency_input_mac.h

Index: media/audio/mac/audio_low_latency_input_mac.h
diff --git a/media/audio/mac/audio_low_latency_input_mac.h b/media/audio/mac/audio_low_latency_input_mac.h
index f3b28911c911e5f573e65dd5d8e8251d958e0ee4..1b79172e7ee1770b697cb8aeb7c776350fdd117d 100644
--- a/media/audio/mac/audio_low_latency_input_mac.h
+++ b/media/audio/mac/audio_low_latency_input_mac.h
@@ -50,7 +50,8 @@ class AUAudioInputStream : public AudioInputStream {
   // The ctor takes all the usual parameters, plus |manager| which is the
   // the audio manager who is creating this object.
   AUAudioInputStream(AudioManagerMac* manager,
-                     const AudioParameters& params);
+                     const AudioParameters& params,
+                     AudioDeviceID audio_device_id);
   // The dtor is typically called by the AudioManager only and it is usually
   // triggered by calling AudioInputStream::Close().
   virtual ~AUAudioInputStream();