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

services/video_capture/public/interfaces/video_capture_device_factory.mojom

Index: services/video_capture/public/interfaces/video_capture_device_factory.mojom
diff --git a/services/video_capture/public/interfaces/video_capture_device_factory.mojom b/services/video_capture/public/interfaces/video_capture_device_factory.mojom
index e637142556d5f1f3c0cc0b6ee07ef6342d34161a..f336ffe605fd5b2e03952ee97f9c156749d232bc 100644
--- a/services/video_capture/public/interfaces/video_capture_device_factory.mojom
+++ b/services/video_capture/public/interfaces/video_capture_device_factory.mojom
@@ -27,6 +27,12 @@ enum VideoCaptureTransportType {
   OTHER_TRANSPORT
 };
 
+enum DeviceAccessResultCode {
+  NOT_INITIALIZED,
+  SUCCESS,
+  ERROR_DEVICE_NOT_FOUND
+};
+
 struct VideoCaptureDeviceDescriptor {
   string display_name;
   string device_id;
@@ -51,6 +57,8 @@ interface VideoCaptureDeviceFactory {
   GetSupportedFormats(VideoCaptureDeviceDescriptor device_descriptor)
       => (array<VideoCaptureFormat> supported_formats);
 
+  // Provides exclusive access to the device identified by |device_descriptor|.
   CreateDevice(VideoCaptureDeviceDescriptor device_descriptor,
-               VideoCaptureDevice& device_request);
+                    VideoCaptureDevice& device_request)
+      => (DeviceAccessResultCode result_code);
 };