Refactor TransformPoint{,Reverse}.

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"
@@ skipping 164 matching lines @@
   //    transforms would have on z values.
   //
   void FlattenTo2d();
 
   // Returns the translation components of the matrix. It is an error to call
   // this function if the transform does not represent only a 2d translation.
   Vector2dF To2dTranslation() const;
 
   // Applies the transformation on the point. Returns true if the point is
   // transformed successfully.
-  void TransformPoint(Point3F& point) const;
+  void TransformPoint(Point3F* point) const;
 
   // Applies the transformation on the point. Returns true if the point is
   // transformed successfully. Rounds the result to the nearest point.
-  void TransformPoint(Point& point) const;
+  void TransformPoint(Point* point) const;
 
   // Applies the reverse transformation on the point. Returns true if the
   // transformation can be inverted.
-  bool TransformPointReverse(Point3F& point) const;
+  bool TransformPointReverse(Point3F* point) const;
 
   // Applies the reverse transformation on the point. Returns true if the
   // transformation can be inverted. Rounds the result to the nearest point.
-  bool TransformPointReverse(Point& point) const;
+  bool TransformPointReverse(Point* point) const;
 
   // Applies transformation on the rectangle. Returns true if the transformed
   // rectangle was axis aligned. If it returns false, rect will be the
   // smallest axis aligned bounding box containing the transformed rect.
   void TransformRect(RectF* rect) const;
 
   // Applies the reverse transformation on the rectangle. Returns true if
   // the transformed rectangle was axis aligned. If it returns false,
   // rect will be the smallest axis aligned bounding box containing the
   // transformed rect.
@@ skipping 22 matching lines @@
   }
 
   // Returns the underlying matrix.
   const SkMatrix44& matrix() const { return matrix_; }
   SkMatrix44& matrix() { return matrix_; }
 
   std::string ToString() const;
 
  private:
   void TransformPointInternal(const SkMatrix44& xform,
-                              Point& point) const;
+                              Point* point) const;
 
   void TransformPointInternal(const SkMatrix44& xform,
-                              Point3F& point) const;
+                              Point3F* point) const;
 
   SkMatrix44 matrix_;
 
   // copy/assign are allowed.
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_TRANSFORM_H_