Pass camera facing to WebKit

media/capture/video_capture_types.h

Index: media/capture/video_capture_types.h
diff --git a/media/capture/video_capture_types.h b/media/capture/video_capture_types.h
index 7a6246beaf6cd2af413654378a8a60475302feff..5bdeb1b6f04de47dd28faf3e6b06332a74bfb839 100644
--- a/media/capture/video_capture_types.h
+++ b/media/capture/video_capture_types.h
@@ -28,6 +28,12 @@ enum VideoPixelStorage {
   PIXEL_STORAGE_MAX = PIXEL_STORAGE_CPU,
 };
 
+enum CameraFacing {

[mcasas, 2017/01/05 20:26:37]

This should be an enum class, right?

[shenghao, 2017/01/06 09:43:01]

Done.

+  FRONT = 0,
+  BACK = 1,
+  DEFAULT = FRONT,

[miu, 2017/01/05 21:55:33]

This is not correct for the screen capture devices (IIUC what "front means").

Also, could you add comments here to des ribe these? E.g., "FRONT means a
person's right will be on the left in the video."

[shenghao, 2017/01/06 09:43:01]

Done.

+};
+
 // Policies for capture devices that have source content that varies in size.
 // It is up to the implementation how the captured content will be transformed
 // (e.g., scaling and/or letterboxing) in order to produce video frames that