Pass camera facing to WebKit

content/renderer/media/media_stream_video_capturer_source.h

Index: content/renderer/media/media_stream_video_capturer_source.h
diff --git a/content/renderer/media/media_stream_video_capturer_source.h b/content/renderer/media/media_stream_video_capturer_source.h
index 14c1fb3a1a1cd9184a2a0b1453ee7bc34be27e2b..13b4d08276475e0edeb5b4ba23c6b2ebb4c13768 100644
--- a/content/renderer/media/media_stream_video_capturer_source.h
+++ b/content/renderer/media/media_stream_video_capturer_source.h
@@ -34,6 +34,7 @@ class CONTENT_EXPORT MediaStreamVideoCapturerSource
                                  const StreamDeviceInfo& device_info,
                                  RenderFrame* render_frame);
   ~MediaStreamVideoCapturerSource() override;
+  media::CameraFacing GetCameraFacing() override;
 
  private:
   friend class CanvasCaptureHandlerTest;