Renderer side audio device change wip...

media/base/media_switches.cc

Index: media/base/media_switches.cc
diff --git a/media/base/media_switches.cc b/media/base/media_switches.cc
index acd696eeaec612af599dddc3b83ffdb36d172477..8f73a408878f346676dce97ebbc6a0ec6465ab7c 100644
--- a/media/base/media_switches.cc
+++ b/media/base/media_switches.cc
@@ -63,4 +63,8 @@ const char kEnableOpusPlayback[] = "enable-opus-playback";
 // Enables VP9 playback in media elements.
 const char kEnableVp9Playback[] = "enable-vp9-playback";
 
+// Force audio input streams to be created as virtual streams. Can be used
+// with WebRTC apps for audio mirroring testing.
+const char kForceAudioMirroring[] = "force-audio-mirroring";
+
 }  // namespace switches