Pass camera facing to WebKit

content/renderer/media/media_stream_video_source.cc

Index: content/renderer/media/media_stream_video_source.cc
diff --git a/content/renderer/media/media_stream_video_source.cc b/content/renderer/media/media_stream_video_source.cc
index c95f429b466454e534878c674a5cc31578e43c46..64748bedd8725e4c69e76f56e9cffe8e85589c92 100644
--- a/content/renderer/media/media_stream_video_source.cc
+++ b/content/renderer/media/media_stream_video_source.cc
@@ -433,6 +433,10 @@ const media::VideoCaptureFormat*
   return nullptr;
 }
 
+media::mojom::VideoFacingMode MediaStreamVideoSource::GetVideoFacing() {
+  return media::mojom::VideoFacingMode::NONE;
+}
+
 void MediaStreamVideoSource::DoStopSource() {
   DCHECK(CalledOnValidThread());
   DVLOG(3) << "DoStopSource()";