Add chrome://vr-shell-ui internal page

chrome/browser/ui/webui/vr_shell/vr_shell_ui_message_handler.h

+// 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.
+
+#ifndef CHROME_BROWSER_UI_WEBUI_VR_SHELL_VR_SHELL_UI_MESSAGE_HANDLER_H_
+#define CHROME_BROWSER_UI_WEBUI_VR_SHELL_VR_SHELL_UI_MESSAGE_HANDLER_H_
+
+#include <string>
+
+#include "base/macros.h"
+#include "content/public/browser/web_ui_message_handler.h"
+
+namespace base {
+class ListValue;
+}
+
+namespace vr_shell {
+class VrShell;
+}
+
+class VrShellUIMessageHandler : public content::WebUIMessageHandler {
+ public:
+  VrShellUIMessageHandler();
+  ~VrShellUIMessageHandler() override;
+
+ private:
+  // content::WebUIMessageHandler:
+  void RegisterMessages() override;
+
+  void HandleDomLoaded(const base::ListValue* args);
+  void HandleSetDevicePixelRatio(const base::ListValue* args);
+  void HandleAddMesh(const base::ListValue* args);
+  void HandleRemoveMesh(const base::ListValue* args);
+  void HandleAddAnimations(const base::ListValue* args);
+  void HandleDoAction(const base::ListValue* args);
+
+  DISALLOW_COPY_AND_ASSIGN(VrShellUIMessageHandler);
+};
+
+#endif  // CHROME_BROWSER_UI_WEBUI_VR_SHELL_VR_SHELL_UI_MESSAGE_HANDLER_H_