ui: Make gfx::Point::Scale() mutate the class, similar to gfx::Rect.

ui/gfx/quad_f.cc

 // 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.
 
 #include "ui/gfx/quad_f.h"
 
 #include <cmath>
 #include <limits>
 
 #include "base/stringprintf.h"
@@ skipping 113 matching lines @@
 
 RectF QuadF::BoundingBox() const {
   float rl = std::min(std::min(p1_.x(), p2_.x()), std::min(p3_.x(), p4_.x()));
   float rr = std::max(std::max(p1_.x(), p2_.x()), std::max(p3_.x(), p4_.x()));
   float rt = std::min(std::min(p1_.y(), p2_.y()), std::min(p3_.y(), p4_.y()));
   float rb = std::max(std::max(p1_.y(), p2_.y()), std::max(p3_.y(), p4_.y()));
   return RectF(rl, rt, rr - rl, rb - rt);
 }
 
 void QuadF::Scale(float x_scale, float y_scale) {
-  p1_ = p1_.Scale(x_scale, y_scale);
-  p2_ = p2_.Scale(x_scale, y_scale);
-  p3_ = p3_.Scale(x_scale, y_scale);
-  p4_ = p4_.Scale(x_scale, y_scale);
+  p1_.Scale(x_scale, y_scale);
+  p2_.Scale(x_scale, y_scale);
+  p3_.Scale(x_scale, y_scale);
+  p4_.Scale(x_scale, y_scale);
 }
 
 void QuadF::operator+=(const Vector2dF& rhs) {
   p1_ += rhs;
   p2_ += rhs;
   p3_ += rhs;
   p4_ += rhs;
 }
 
 void QuadF::operator-=(const Vector2dF& rhs) {
   p1_ -= rhs;
   p2_ -= rhs;
   p3_ -= rhs;
   p4_ -= rhs;
 }
 
 QuadF operator+(const QuadF& lhs, const Vector2dF& rhs) {
   QuadF result = lhs;
   result += rhs;
   return result;
 }
 
 QuadF operator-(const QuadF& lhs, const Vector2dF& rhs) {
   QuadF result = lhs;
   result -= rhs;
   return result;
 }
 
 }  // namespace gfx