Add support of vrdisplayconnect and vrdisplaydisconnect event

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>
@@ skipping 33 matching lines @@
   DEVICE_VR_EXPORT mojo::Array<VRDisplayPtr> GetVRDevices();
 
   // Manage presentation to only allow a single service and device at a time.
   DEVICE_VR_EXPORT bool RequestPresent(VRServiceImpl* service,
                                        unsigned int index);
   DEVICE_VR_EXPORT void ExitPresent(VRServiceImpl* service, unsigned int index);
   void SubmitFrame(VRServiceImpl* service, unsigned int index, VRPosePtr pose);
 
   // VRClientDispatcher implementation
   void OnDeviceChanged(VRDisplayPtr device) override;
+  void OnDeviceConnectionStatusChanged(VRDevice* device,
+                                       bool is_connected) override;
 
  private:
   friend class VRDeviceManagerTest;
   friend class VRServiceImplTest;
 
   VRDeviceManager();
   // Constructor for testing.
   DEVICE_VR_EXPORT explicit VRDeviceManager(
       std::unique_ptr<VRDeviceProvider> provider);
 
@@ skipping 33 matching lines @@
   base::ThreadChecker thread_checker_;
 
   base::RepeatingTimer timer_;
 
   DISALLOW_COPY_AND_ASSIGN(VRDeviceManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_VR_VR_DEVICE_MANAGER_H