Avoid duplicate math when computing VR scene hierarchy.

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 "chrome/browser/android/vr_shell/vr_math.h"
 
 namespace base {
 class DictionaryValue;
 class ListValue;
 }
 
 namespace vr_shell {
 
 class Animation;
 struct ContentRectangle;
-struct Transform;
 
 class UiScene {
  public:
   enum Command {
     ADD_ELEMENT,
     UPDATE_ELEMENT,
     REMOVE_ELEMENT,
     ADD_ANIMATION,
     REMOVE_ANIMATION,
     CONFIGURE_SCENE,
@@ skipping 37 matching lines @@
 
   std::vector<const ContentRectangle*> GetWorldElements() const;
   std::vector<const ContentRectangle*> GetHeadLockedElements() const;
   bool HasVisibleHeadLockedElements() const;
 
   const Colorf& GetBackgroundColor() const;
   float GetBackgroundDistance() const;
   bool GetWebVrRenderingEnabled() const;
 
  private:
-  void ApplyRecursiveTransforms(const ContentRectangle& element,
-                                Transform* transform,
-                                float* opacity,
-                                bool* lock_to_fov);
+  void ApplyRecursiveTransforms(ContentRectangle* element);
   void ApplyDictToElement(const base::DictionaryValue& dict,
                           ContentRectangle* element);
 
   std::vector<std::unique_ptr<ContentRectangle>> ui_elements_;
   ContentRectangle* content_element_ = nullptr;
   Colorf background_color_ = {0.1f, 0.1f, 0.1f, 1.0f};
   float background_distance_ = 10.0f;
   bool webvr_rendering_enabled_ = true;
 
   DISALLOW_COPY_AND_ASSIGN(UiScene);
 };
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_UI_SCENE_H_