Notify VRDeviceProviders when there are pages listening for vrdisplayactivate

device/vr/vr_service_impl.cc

Index: device/vr/vr_service_impl.cc
diff --git a/device/vr/vr_service_impl.cc b/device/vr/vr_service_impl.cc
index ad12ace4c8affb86b0ddca747b7a4eeb83811ea6..49ddde0482efb074ec3eb3977ea272730a3a817e 100644
--- a/device/vr/vr_service_impl.cc
+++ b/device/vr/vr_service_impl.cc
@@ -12,7 +12,7 @@
 
 namespace device {
 
-VRServiceImpl::VRServiceImpl() {}
+VRServiceImpl::VRServiceImpl() : listening_for_activate_(false) {}
 
 VRServiceImpl::~VRServiceImpl() {
   RemoveFromDeviceManager();
@@ -67,4 +67,10 @@ void VRServiceImpl::SetClient(mojom::VRServiceClientPtr service_client,
   callback.Run(device_manager->GetNumberOfConnectedDevices());
 }
 
+void VRServiceImpl::SetListeningForActivate(bool listening) {
+  listening_for_activate_ = listening;
+  VRDeviceManager* device_manager = VRDeviceManager::GetInstance();
+  device_manager->ListeningForActivateChanged(listening);
+}
+
 }  // namespace device