Implement WebVR presentation pausing for VR Shell Menu Mode

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 81bbf5e564a8ae7731e9abcfed6fec49f79c64fd..fdda0fa5457cd73805c66b20fa41e19c5a86c1f4 100644
--- a/device/vr/vr_device.h
+++ b/device/vr/vr_device.h
@@ -27,10 +27,10 @@ const unsigned int VR_DEVICE_LAST_ID = 0xFFFFFFFF;
 
 class DEVICE_VR_EXPORT VRDevice {
  public:
-  explicit VRDevice(VRDeviceProvider* provider);
+  explicit VRDevice(scoped_refptr<VRDeviceProvider> provider);
   virtual ~VRDevice();
 
-  VRDeviceProvider* provider() const { return provider_; }
+  scoped_refptr<VRDeviceProvider> provider() const;
   unsigned int id() const { return id_; }
 
   virtual mojom::VRDisplayInfoPtr GetVRDevice() = 0;
@@ -54,6 +54,8 @@ class DEVICE_VR_EXPORT VRDevice {
 
   virtual void OnDisplayChanged();
   virtual void OnExitPresent(VRServiceImpl* service);
+  virtual void OnDisplayBlur();
+  virtual void OnDisplayFocus();
 
  protected:
   // Each Service have one VRDisplay with one VRDevice.
@@ -67,7 +69,7 @@ class DEVICE_VR_EXPORT VRDevice {
   VRServiceImpl* presenting_service_;
 
  private:
-  VRDeviceProvider* provider_;
+  scoped_refptr<VRDeviceProvider> provider_;
   unsigned int id_;
 
   static unsigned int next_id_;