Add Vector2d classes that represent offsets, instead of using Point.

ui/gfx/rect_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/rect_f.h"
 
 #include "base/logging.h"
 #include "base/stringprintf.h"
 #include "ui/gfx/insets_f.h"
 #include "ui/gfx/rect_base_impl.h"
 
 namespace gfx {
 
-template class RectBase<RectF, PointF, SizeF, InsetsF, float>;
+template class RectBase<RectF, PointF, SizeF, InsetsF, Vector2dF, float>;
 
-typedef class RectBase<RectF, PointF, SizeF, InsetsF, float> RectBaseT;
+typedef class RectBase<RectF, PointF, SizeF, InsetsF, Vector2dF,
+                       float> RectBaseT;
 
 RectF::RectF() : RectBaseT(gfx::SizeF()) {
 }
 
 RectF::RectF(float width, float height)
     : RectBaseT(gfx::SizeF(width, height)) {
 }
 
 RectF::RectF(float x, float y, float width, float height)
     : RectBaseT(gfx::PointF(x, y), gfx::SizeF(width, height)) {
@@ skipping 33 matching lines @@
   return result;
 }
 
 RectF ScaleRect(const RectF& r, float x_scale, float y_scale) {
   RectF result = r;
   result.Scale(x_scale, y_scale);
   return result;
 }
 
 }  // namespace gfx