Add GetOutputStreamParameters, GetAssociatedOutputDeviceID to AudioManager.

media/audio/win/core_audio_util_win.h

Index: media/audio/win/core_audio_util_win.h
diff --git a/media/audio/win/core_audio_util_win.h b/media/audio/win/core_audio_util_win.h
index beb0e9c0c9b2296b21776cdda1a7aa92249c908e..cdf6dfb11df5e0ed56cbb27f1d98cc57bedcea02 100644
--- a/media/audio/win/core_audio_util_win.h
+++ b/media/audio/win/core_audio_util_win.h
@@ -59,6 +59,10 @@ class MEDIA_EXPORT CoreAudioUtil {
   static ScopedComPtr<IMMDevice> CreateDefaultDevice(
       EDataFlow data_flow, ERole role);
 
+  // Returns the device id of the default output device or an empty string
+  // if no such device exists or if the default device has been disabled.
+  static std::string GetDefaultOutputDeviceID();
+
   // Creates an endpoint device that is specified by a unique endpoint device-
   // identification string.
   static ScopedComPtr<IMMDevice> CreateDevice(const std::string& device_id);