Pass camera facing to WebKit

content/renderer/media/media_stream_video_track.cc

Index: content/renderer/media/media_stream_video_track.cc
diff --git a/content/renderer/media/media_stream_video_track.cc b/content/renderer/media/media_stream_video_track.cc
index dede54fecb104f1e46e97f43eb0ba1d2ed1dea20..dda31a044836b2a511b036c6b87e53e2443ecbfa 100644
--- a/content/renderer/media/media_stream_video_track.cc
+++ b/content/renderer/media/media_stream_video_track.cc
@@ -307,6 +307,21 @@ void MediaStreamVideoTrack::getSettings(
       settings.frameRate = format->frame_rate;
       settings.width = format->frame_size.width();
       settings.height = format->frame_size.height();
+      const media::CameraFacing facing = source_->GetCameraFacing();
+      switch (facing) {
+        case media::CameraFacing::FRONT:
+          settings.facingMode =
+              blink::WebMediaStreamTrack::Settings::VideoFacingMode::User;
+          break;
+        case media::CameraFacing::BACK:
+          settings.facingMode = blink::WebMediaStreamTrack::Settings::
+              VideoFacingMode::Environment;
+          break;
+        case media::CameraFacing::DEFAULT:
+          // TODO(hta): assign VideoFacingMode::Unknown once we have it:
+          // b/34118695.
+          break;
+      }
     }
   }
   // TODO(hta): Extract the real value.