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

ui/gfx/point_unittest.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/point_base.h"
 
 #include "base/basictypes.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/point.h"
 #include "ui/gfx/point_conversions.h"
@@ skipping 80 matching lines @@
   EXPECT_EQ(Point(11, 11), ToRoundedPoint(PointF(10.5f, 10.5f)));
   EXPECT_EQ(Point(11, 11), ToRoundedPoint(PointF(10.9999f, 10.9999f)));
 
   EXPECT_EQ(Point(-10, -10), ToRoundedPoint(PointF(-10, -10)));
   EXPECT_EQ(Point(-10, -10), ToRoundedPoint(PointF(-10.0001f, -10.0001f)));
   EXPECT_EQ(Point(-10, -10), ToRoundedPoint(PointF(-10.4999f, -10.4999f)));
   EXPECT_EQ(Point(-11, -11), ToRoundedPoint(PointF(-10.5f, -10.5f)));
   EXPECT_EQ(Point(-11, -11), ToRoundedPoint(PointF(-10.9999f, -10.9999f)));
 }
 
+TEST(PointTest, Scale) {
+  EXPECT_EQ(PointF().ToString(), ScalePoint(Point(), 2).ToString());
+  EXPECT_EQ(PointF().ToString(), ScalePoint(Point(), 2, 2).ToString());
+
+  EXPECT_EQ(PointF(2, -2).ToString(),
+            ScalePoint(Point(1, -1), 2).ToString());
+  EXPECT_EQ(PointF(2, -2).ToString(),
+            ScalePoint(Point(1, -1), 2, 2).ToString());
+
+  PointF zero;
+  PointF one(1, -1);
+
+  zero.Scale(2);
+  zero.Scale(3, 1.5);
+
+  one.Scale(2);
+  one.Scale(3, 1.5);
+
+  EXPECT_EQ(PointF().ToString(), zero.ToString());
+  EXPECT_EQ(PointF(6, -3).ToString(), one.ToString());
+}
+
 }  // namespace gfx