Video Capture Mojo (1.4a.a): Add service configurator interface

services/video_capture/video_capture_device_impl.h

Index: services/video_capture/video_capture_device_impl.h
diff --git a/services/video_capture/video_capture_device_impl.h b/services/video_capture/video_capture_device_impl.h
index 89b187961f2d9f8642f7eda3dc35f43edcd97433..94ef1176547cbd583b5ab9e2deda29793a882b78 100644
--- a/services/video_capture/video_capture_device_impl.h
+++ b/services/video_capture/video_capture_device_impl.h
@@ -9,10 +9,11 @@
 
 namespace video_capture {
 
-// Implementation of the VideoCaptureDevice Mojo interface.
+// Implementation of mojom::VideoCaptureDeviceProxy backed by a given instance
+// of media::VideoCaptureDevice.
 class VideoCaptureDeviceImpl : public mojom::VideoCaptureDevice {
  public:
-  // mojom::VideoCaptureDevice:
+  // mojom::VideoCaptureDeviceProxy:
   void Start(mojom::VideoCaptureFormatPtr requested_format,
              mojom::ResolutionChangePolicy resolution_change_policy,
              mojom::PowerLineFrequency power_line_frequency,