The first step to add device selection to linux.

media/audio/audio_device_name.h

Index: media/audio/audio_device_name.h
===================================================================
--- media/audio/audio_device_name.h	(revision 104076)
+++ media/audio/audio_device_name.h	(working copy)
@@ -11,7 +11,10 @@
 namespace media {
 
 struct AudioDeviceName {
-  std::string device_name;  // Name and also display name of the device.
+  AudioDeviceName();
+  AudioDeviceName(std::string device_name, std::string unique_id);
+
+  std::string device_name;  // Friendly name of the device.
   std::string unique_id;    // Unique identifier for the device.
 };