Migrate from MathUtil::inverse() to gfx::Transform::GetInverse()

ui/gfx/transform.h

 // Copyright (c) 2012 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 UI_GFX_TRANSFORM_H_
 #define UI_GFX_TRANSFORM_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "third_party/skia/include/utils/SkMatrix44.h"
 #include "ui/base/ui_export.h"
 
 namespace gfx {
 
 class RectF;
 class Point;
 class Point3F;
 class Vector3dF;
 
 // 4x4 transformation matrix. Transform is cheap and explicitly allows
 // copy/assign.
 class UI_EXPORT Transform {
  public:
+
+  enum SkipInitialization {
+    kSkipInitialization
+  };
+
   Transform() : matrix_(SkMatrix44::kIdentity_Constructor) {}
+
+  // Skips initializing this matrix to avoid overhead, when we know it will be
+  // initialized before use.
+  Transform(SkipInitialization)
+      : matrix_(SkMatrix44::kUninitialized_Constructor) {}
   Transform(const Transform& rhs) : matrix_(rhs.matrix_) {}
   // Initialize with the concatenation of lhs * rhs.
   Transform(const Transform& lhs, const Transform& rhs)
       : matrix_(lhs.matrix_, rhs.matrix_) {}
   ~Transform() {}
 
   bool operator==(const Transform& rhs) const { return matrix_ == rhs.matrix_; }
   bool operator!=(const Transform& rhs) const { return matrix_ != rhs.matrix_; }
 
   // Resets this transform to the identity transform.
@@ skipping 137 matching lines @@
                               Point3F& point) const;
 
   SkMatrix44 matrix_;
 
   // copy/assign are allowed.
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_TRANSFORM_H_