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

services/video_capture/device_factory_media_to_mojo_adapter.h

 // 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.
 
 #ifndef SERVICES_VIDEO_CAPTURE_DEVICE_FACTORY_MEDIA_TO_MOJO_ADAPTER_H_
 #define SERVICES_VIDEO_CAPTURE_DEVICE_FACTORY_MEDIA_TO_MOJO_ADAPTER_H_
 
 #include <map>
 
 #include "media/capture/video/video_capture_device_client.h"
 #include "media/capture/video/video_capture_system.h"
 #include "mojo/public/cpp/bindings/binding.h"
+#include "services/service_manager/public/cpp/service_context_ref.h"
 #include "services/video_capture/public/interfaces/device_factory.mojom.h"
 
 namespace video_capture {
 
 class DeviceMediaToMojoAdapter;
 
 // Wraps a media::VideoCaptureSystem and exposes its functionality through the
 // mojom::DeviceFactory interface. Keeps track of device instances that have
 // been created to ensure that it does not create more than one instance of the
 // same media::VideoCaptureDevice at the same time.
 class DeviceFactoryMediaToMojoAdapter : public mojom::DeviceFactory {
  public:
   DeviceFactoryMediaToMojoAdapter(
+      std::unique_ptr<service_manager::ServiceContextRef> service_ref,
       std::unique_ptr<media::VideoCaptureSystem> capture_system,
       const media::VideoCaptureJpegDecoderFactoryCB&
           jpeg_decoder_factory_callback);
   ~DeviceFactoryMediaToMojoAdapter() override;
 
-  // mojom::DeviceFactory:
+  // mojom::DeviceFactory implementation.
   void GetDeviceInfos(const GetDeviceInfosCallback& callback) override;
   void CreateDevice(const std::string& device_id,
                     mojom::DeviceRequest device_request,
                     const CreateDeviceCallback& callback) override;
 
  private:
   struct ActiveDeviceEntry {
     ActiveDeviceEntry();
     ~ActiveDeviceEntry();
     ActiveDeviceEntry(ActiveDeviceEntry&& other);
     ActiveDeviceEntry& operator=(ActiveDeviceEntry&& other);
 
     std::unique_ptr<DeviceMediaToMojoAdapter> device;
     // TODO(chfremer) Use mojo::Binding<> directly instead of unique_ptr<> when
     // mojo::Binding<> supports move operators.
     // https://crbug.com/644314
     std::unique_ptr<mojo::Binding<mojom::Device>> binding;
   };
 
+  void CreateAndAddNewDevice(const std::string& device_id,
+                             mojom::DeviceRequest device_request,
+                             const CreateDeviceCallback& callback);
   void OnClientConnectionErrorOrClose(const std::string& device_id);
 
+  const std::unique_ptr<service_manager::ServiceContextRef> service_ref_;
   const std::unique_ptr<media::VideoCaptureSystem> capture_system_;
   const media::VideoCaptureJpegDecoderFactoryCB jpeg_decoder_factory_callback_;
   std::map<std::string, ActiveDeviceEntry> active_devices_by_id_;
+  bool has_called_get_device_infos_;
+
+  base::WeakPtrFactory<DeviceFactoryMediaToMojoAdapter> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(DeviceFactoryMediaToMojoAdapter);
 };
 
 }  // namespace video_capture
 
 #endif  // SERVICES_VIDEO_CAPTURE_DEVICE_FACTORY_MEDIA_TO_MOJO_ADAPTER_H_