Make UiElement a class

chrome/browser/android/vr_shell/ui_scene.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_ANDROID_VR_SHELL_UI_SCENE_H_
 #define CHROME_BROWSER_ANDROID_VR_SHELL_UI_SCENE_H_
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
 #include "device/vr/vr_types.h"
 
 namespace base {
 class ListValue;
 class TimeTicks;
 }
 
 namespace vr_shell {
 
 class Animation;
-struct UiElement;
+class UiElement;
 
 class UiScene {
  public:
   enum Command {
     ADD_ELEMENT,
     UPDATE_ELEMENT,
     REMOVE_ELEMENT,
     ADD_ANIMATION,
     REMOVE_ANIMATION,
     CONFIGURE_SCENE,
@@ skipping 48 matching lines @@
   float background_distance_ = 10.0f;
   bool webvr_rendering_enabled_ = true;
   bool gl_initialized_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(UiScene);
 };
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_UI_SCENE_H_