Reland 15721002: Hook up the device selection to the WebAudio live audio

media/audio/win/audio_unified_win.h

Index: media/audio/win/audio_unified_win.h
diff --git a/media/audio/win/audio_unified_win.h b/media/audio/win/audio_unified_win.h
index 3561ae47a9c601e6dfbb35d584176046a893aa10..76c53297b51a6766bd7f69a5c5a213be941c68ae 100644
--- a/media/audio/win/audio_unified_win.h
+++ b/media/audio/win/audio_unified_win.h
@@ -84,7 +84,8 @@ class MEDIA_EXPORT WASAPIUnifiedStream
   // The ctor takes all the usual parameters, plus |manager| which is the
   // the audio manager who is creating this object.
   WASAPIUnifiedStream(AudioManagerWin* manager,
-                      const AudioParameters& params);
+                      const AudioParameters& params,
+                      const std::string& input_device_id);
 
   // The dtor is typically called by the AudioManager only and it is usually
   // triggered by calling AudioOutputStream::Close().
@@ -183,6 +184,9 @@ class MEDIA_EXPORT WASAPIUnifiedStream
   int input_channels_;
   int output_channels_;
 
+  // Unique ID of the input device to be opened.
+  const std::string input_device_id_;
+
   // The sharing mode for the streams.
   // Valid values are AUDCLNT_SHAREMODE_SHARED and AUDCLNT_SHAREMODE_EXCLUSIVE
   // where AUDCLNT_SHAREMODE_SHARED is the default.