Add support of vrdisplayconnect and vrdisplaydisconnect event

device/vr/android/gvr/gvr_device_provider.cc

 // Copyright 2016 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.
 
 #include "device/vr/android/gvr/gvr_device_provider.h"
 
 #include <jni.h>
 
 #include "base/android/context_utils.h"
 #include "base/android/jni_android.h"
@@ skipping 77 matching lines @@
 void GvrDeviceProvider::Initialize() {
   if (!delegate_) {
     delegate_.reset(new GvrDeviceProviderDelegate());
   }
 }
 
 void GvrDeviceProvider::OnDelegateInitialized(GvrDelegate* delegate) {
   if (!vr_device_)
     vr_device_.reset(new GvrDevice(this, delegate));
 
-  // Should fire a vrdisplayconnected event here.
+  if (vr_device_)
+    vr_device_->UpdateConnectionStatus(true);
 }
 
 void GvrDeviceProvider::OnDelegateShutdown() {
   // Nothing to do here just yet. Eventually want to shut down the VRDevice and
   // fire a vrdisplaydisconnected event.
+  if (vr_device_)
+    vr_device_->UpdateConnectionStatus(false);
+}
+
+void GvrDeviceProvider::PollEvents(VRClientDispatcher* client) {
+  if (vr_device_)
+    vr_device_->PollEvents(client);
 }
 
 }  // namespace device