Remove unnecessary UI element math.

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 ReversibleTransform;
+struct Transform;
 
 class UiScene {
  public:
   enum Command {
     ADD_ELEMENT,
     UPDATE_ELEMENT,
     REMOVE_ELEMENT,
     ADD_ANIMATION,
     REMOVE_ANIMATION,
     UPDATE_BACKGROUND,
@@ skipping 18 matching lines @@
   // Add an animation according to a dictionary passed from the UI HTML.
   void AddAnimationFromDict(const base::DictionaryValue& dict,
                             int64_t time_in_micro);
 
   // Remove |animation_id| from element |element_id|.
   void RemoveAnimation(int element_id, int animation_id);
 
   void UpdateBackgroundFromDict(const base::DictionaryValue& dict);
 
   // Update the positions of all elements in the scene, according to active
-  // animations, desired screen tilt and time.  The units of time are
-  // arbitrary, but must match the unit used in animations.
-  void UpdateTransforms(float screen_tilt, int64_t time_in_micro);
+  // animations and time.  The units of time are arbitrary, but must match the
+  // unit used in animations.
+  void UpdateTransforms(int64_t time_in_micro);
 
   // Handle a batch of commands passed from the UI HTML.
   void HandleCommands(std::unique_ptr<base::ListValue> commands,
                       int64_t time_in_micro);
 
   const std::vector<std::unique_ptr<ContentRectangle>>& GetUiElements() const;
 
   ContentRectangle* GetUiElementById(int element_id);
 
   const Colorf& GetBackgroundColor();
   float GetBackgroundDistance();
 
  private:
   void ApplyRecursiveTransforms(const ContentRectangle& element,
-                                ReversibleTransform* transform,
+                                Transform* transform,
                                 float* opacity);
   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;
 
   DISALLOW_COPY_AND_ASSIGN(UiScene);
 };
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_UI_SCENE_H_