Adds support for CoreAudioUtil::IsChannelLayoutSupported()

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 5059856af7ad51b222bc681ae1fa4d64921d0509..2dac60a86bd0151e2824e56629f7e810cba3853f 100644
--- a/media/audio/win/core_audio_util_win.h
+++ b/media/audio/win/core_audio_util_win.h
@@ -117,6 +117,14 @@ class MEDIA_EXPORT CoreAudioUtil {
                                 AUDCLNT_SHAREMODE share_mode,
                                 const WAVEFORMATPCMEX* format);
 
+  // Returns true if the specified |channel_layout| is supported for the
+  // default IMMDevice where flow direction and role is define by |data_flow|
+  // and |role|. If this method returns true for a certain channel layout, it
+  // means that SharedModeInitialize() will succeed using a format based on
+  // the preferred format where the channel layout has been modified.
+  static bool IsChannelLayoutSupported(EDataFlow data_flow, ERole role,
+                                       ChannelLayout channel_layout);
+
   // For a shared-mode stream, the audio engine periodically processes the
   // data in the endpoint buffer at the period obtained in |device_period|.
   // For an exclusive mode stream, |device_period| corresponds to the minimum