Implement WebVR presentation pausing for VR Shell Menu Mode

device/vr/vr_device_manager.h

 // Copyright 2015 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 DEVICE_VR_VR_DEVICE_MANAGER_H
 #define DEVICE_VR_VR_DEVICE_MANAGER_H
 
 #include <stdint.h>
 
 #include <map>
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
-#include "base/memory/linked_ptr.h"
+#include "base/memory/ref_counted.h"
 #include "base/threading/thread_checker.h"
 #include "base/timer/timer.h"
 #include "device/vr/vr_device.h"
 #include "device/vr/vr_device_provider.h"
 #include "device/vr/vr_export.h"
 #include "device/vr/vr_service.mojom.h"
 #include "device/vr/vr_service_impl.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
 
 namespace device {
@@ skipping 27 matching lines @@
   static void SetInstance(VRDeviceManager* service);
   static bool HasInstance();
 
   void InitializeProviders();
   void RegisterProvider(std::unique_ptr<VRDeviceProvider> provider);
 
   void SchedulePollEvents();
   void PollEvents();
   void StopSchedulingPollEvents();
 
-  using ProviderList = std::vector<linked_ptr<VRDeviceProvider>>;
+  using ProviderList = std::vector<std::unique_ptr<VRDeviceProvider>>;
   ProviderList providers_;
 
   // Devices are owned by their providers.
   using DeviceMap = std::map<unsigned int, VRDevice*>;
   DeviceMap devices_;
 
   bool vr_initialized_;
 
   using ServiceList = std::vector<VRServiceImpl*>;
   ServiceList services_;
 
   // For testing. If true will not delete self when consumer count reaches 0.
   bool keep_alive_;
 
   bool has_scheduled_poll_;
 
   base::ThreadChecker thread_checker_;
 
   base::RepeatingTimer timer_;
 
   DISALLOW_COPY_AND_ASSIGN(VRDeviceManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_VR_VR_DEVICE_MANAGER_H