Adding Chrome-side WebVR interface

content/browser/vr/vr_service_consumer.cc

+// 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.
+
+#include "content/browser/vr/vr_service_consumer.h"
+
+#include "content/browser/vr/vr_service.h"
+
+namespace content {
+
+VRServiceConsumer::VRServiceConsumer() :
+    service_(NULL),
+    registered_with_service_(false) {
+}
+
+VRServiceConsumer::VRServiceConsumer(VRService* service) :
+    service_(service),
+    registered_with_service_(false) {
+}
+
+VRServiceConsumer::~VRServiceConsumer() {
+  if (registered_with_service_) {
+    service_->RemoveConsumer(this);
+  }
+}
+
+VRService* VRServiceConsumer::GetServiceInstance() {
+  if (!registered_with_service_) {
+    if (!service_) {
+      service_ = VRService::GetInstance();
+    }
+    service_->AddConsumer(this);
+    registered_with_service_ = true;
+  }
+  return service_;
+}
+
+}  // namespace content