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

services/video_capture/service_configurator_impl.cc

+// 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.
+
+#include "base/logging.h"
+#include "services/video_capture/service_configurator_impl.h"
+
+namespace video_capture {
+
+ServiceConfiguratorImpl::ServiceConfiguratorImpl(
+    VideoCaptureDeviceFactoryImpl* factory)
+    : factory_(factory) {}
+
+void ServiceConfiguratorImpl::AddFakeVideoCaptureDevice(
+    const AddFakeVideoCaptureDeviceCallback& callback) {
+  auto descriptor = factory_->AddFakeVideoCaptureDevice();
+  callback.Run(std::move(descriptor));
+}
+
+}  // namespace video_capture