[Mojo Video Capture] Simplify API and some cleanups

services/video_capture/public/interfaces/video_capture_service.mojom

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 module video_capture.mojom;
 
 import "services/video_capture/public/interfaces/mock_video_capture_device.mojom";
+import "services/video_capture/public/interfaces/video_capture_device_descriptor.mojom";
 import "services/video_capture/public/interfaces/video_capture_device_factory.mojom";
+import "ui/gfx/geometry/mojo/geometry.mojom";
 
 // Entry point to the Video Capture Service API.
 // The service hosts three VideoCaptureDeviceFactories. The "regular" factory
 // provides access to the capture devices connected to the system. The "fake"
 // factory provides access to a single fake device that generates test frames.
 // The "mock" factory provides access to a set of mock devices provided by the
 // client, which are useful for verifying that the service implementation
 // operates these devices correctly.
 interface VideoCaptureService {
   ConnectToDeviceFactory(VideoCaptureDeviceFactory& request);
   ConnectToFakeDeviceFactory(VideoCaptureDeviceFactory& request);
   ConnectToMockDeviceFactory(VideoCaptureDeviceFactory& request);
   [Sync] AddDeviceToMockFactory(MockVideoCaptureDevice device,
                                 VideoCaptureDeviceDescriptor descriptor) => ();
 };