[Mojo Video Capture] Stop service when last client disconnects.

services/video_capture/device_factory_provider_impl.h

+// Copyright 2017 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.
+
+#ifndef SERVICES_VIDEO_CAPTURE_DEVICE_FACTORY_PROVIDER_H_
+#define SERVICES_VIDEO_CAPTURE_DEVICE_FACTORY_PROVIDER_H_
+
+#include <memory>
+
+#include "mojo/public/cpp/bindings/binding_set.h"
+#include "services/service_manager/public/cpp/interface_factory.h"
+#include "services/service_manager/public/cpp/service.h"
+#include "services/service_manager/public/cpp/service_context_ref.h"
+#include "services/video_capture/public/interfaces/device_factory_provider.mojom.h"
+
+namespace video_capture {
+
+class DeviceFactoryMediaToMojoAdapter;
+
+class DeviceFactoryProviderImpl : public mojom::DeviceFactoryProvider {
+ public:
+  DeviceFactoryProviderImpl(
+      std::unique_ptr<service_manager::ServiceContextRef> service_ref,
+      base::Callback<void(float)> set_shutdown_delay_cb);
+  ~DeviceFactoryProviderImpl() override;
+
+  // mojom::DeviceFactoryProvider implementation.
+  void ConnectToDeviceFactory(mojom::DeviceFactoryRequest request) override;
+  void ConnectToFakeDeviceFactory(mojom::DeviceFactoryRequest request) override;
+  void SetShutdownDelayInSeconds(float seconds) override;
+
+ private:
+  void LazyInitializeDeviceFactory();
+  void LazyInitializeFakeDeviceFactory();
+
+  mojo::BindingSet<mojom::DeviceFactory> factory_bindings_;
+  mojo::BindingSet<mojom::DeviceFactory> fake_factory_bindings_;
+  std::unique_ptr<DeviceFactoryMediaToMojoAdapter> device_factory_;
+  std::unique_ptr<DeviceFactoryMediaToMojoAdapter> fake_device_factory_;
+
+  const std::unique_ptr<service_manager::ServiceContextRef> service_ref_;
+  base::Callback<void(float)> set_shutdown_delay_cb_;
+
+  DISALLOW_COPY_AND_ASSIGN(DeviceFactoryProviderImpl);
+};
+
+}  // namespace video_capture
+
+#endif  // SERVICES_VIDEO_CAPTURE_DEVICE_FACTORY_PROVIDER_H_