Avoid duplicate math when computing VR scene hierarchy.

chrome/browser/android/vr_shell/ui_elements.cc

 // 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.
 
 #include "chrome/browser/android/vr_shell/ui_elements.h"
 
 #include <limits>
 
 #include "base/logging.h"
 #include "chrome/browser/android/vr_shell/animation.h"
@@ skipping 46 matching lines @@
 }
 
 void Transform::Scale(float sx, float sy, float sz) {
   ScaleM(to_world, to_world, sx, sy, sz);
 }
 
 const gvr::Mat4f& WorldRectangle::TransformMatrix() const {
   return transform_.to_world;
 }
 
-void WorldRectangle::SetTransform(const Transform& transform) {
-  transform_ = transform;
-}
-
 gvr::Vec3f WorldRectangle::GetCenter() const {
   const gvr::Vec3f kOrigin = {0.0f, 0.0f, 0.0f};
   return MatrixVectorMul(transform_.to_world, kOrigin);
 }
 
 gvr::Vec2f WorldRectangle::GetUnitRectangleCoordinates(
     const gvr::Vec3f& world_point) {
   const gvr::Mat4f& transform = transform_.to_world;
   gvr::Vec3f origin = MatrixVectorMul(transform, gvr::Vec3f({0, 0, 0}));
   gvr::Vec3f xAxis = MatrixVectorMul(transform, gvr::Vec3f({1, 0, 0}));
@@ skipping 127 matching lines @@
 
 bool ContentRectangle::IsVisible() const {
   return visible && computed_opacity > 0.0f;
 }
 
 bool ContentRectangle::IsHitTestable() const {
   return IsVisible() && hit_testable;
 }
 
 }  // namespace vr_shell