Pass camera facing to WebKit

media/capture/video_capturer_source.h

Index: media/capture/video_capturer_source.h
diff --git a/media/capture/video_capturer_source.h b/media/capture/video_capturer_source.h
index 91879cfa7d7ca04bf754939bf7265168c7e4a82b..02fd5f05da10b8489d5b95d73649b03b85a5d184 100644
--- a/media/capture/video_capturer_source.h
+++ b/media/capture/video_capturer_source.h
@@ -12,6 +12,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/time/time.h"
 #include "media/capture/capture_export.h"
+#include "media/capture/mojo/video_capture_types.mojom-shared.h"
 #include "media/capture/video_capture_types.h"
 
 namespace media {
@@ -114,6 +115,8 @@ class CAPTURE_EXPORT VideoCapturerSource {
   // may still occur after this call, so the caller must take care to
   // use refcounted or weak references in |new_frame_callback|.
   virtual void StopCapture() = 0;
+
+  virtual mojom::VideoFacingMode GetVideoFacing() const;
 };
 
 }  // namespace media