Add support of vrdisplayconnect and vrdisplaydisconnect event

device/vr/vr_device.h

Index: device/vr/vr_device.h
diff --git a/device/vr/vr_device.h b/device/vr/vr_device.h
index 6c5b0500f7b430b7f1ce1f0e6b32bd5c506dc062..81823678b253b05271d76bcc51434c75bcc32f11 100644
--- a/device/vr/vr_device.h
+++ b/device/vr/vr_device.h
@@ -6,6 +6,7 @@
 #define DEVICE_VR_VR_DEVICE_H
 
 #include "base/macros.h"
+#include "device/vr/vr_client_dispatcher.h"
 #include "device/vr/vr_export.h"
 #include "device/vr/vr_service.mojom.h"
 
@@ -34,6 +35,9 @@ class VRDevice {
   virtual VRDisplayPtr GetVRDevice() = 0;
   virtual VRPosePtr GetPose() = 0;
   virtual void ResetPose() = 0;
+  virtual void PollEvents(VRClientDispatcher* client) = 0;
+
+  virtual void UpdateConnectionStatus(bool isConnected) {}
 
   virtual void RequestPresent(){};
   virtual void ExitPresent(){};