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

chrome/browser/ui/gtk/gtk_util.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 "chrome/browser/ui/gtk/gtk_util.h"
 
 #include <cairo/cairo.h>
 
 #include <algorithm>
 #include <cstdarg>
@@ skipping 466 matching lines @@
 gfx::Size GetWidgetSize(GtkWidget* widget) {
   GtkRequisition size;
   gtk_widget_size_request(widget, &size);
   return gfx::Size(size.width, size.height);
 }
 
 void ConvertWidgetPointToScreen(GtkWidget* widget, gfx::Point* p) {
   DCHECK(widget);
   DCHECK(p);
 
-  gfx::Point position = ui::GetWidgetScreenPosition(widget);
-  p->SetPoint(p->x() + position.x(), p->y() + position.y());
+  *p = p->Add(ui::GetWidgetScreenOffset(widget));
 }
 
 GtkWidget* CenterWidgetInHBox(GtkWidget* hbox, GtkWidget* widget,
                               bool pack_at_end, int padding) {
   GtkWidget* centering_vbox = gtk_vbox_new(FALSE, 0);
   gtk_box_pack_start(GTK_BOX(centering_vbox), widget, TRUE, FALSE, 0);
   if (pack_at_end)
     gtk_box_pack_end(GTK_BOX(hbox), centering_vbox, FALSE, FALSE, padding);
   else
     gtk_box_pack_start(GTK_BOX(hbox), centering_vbox, FALSE, FALSE, padding);
@@ skipping 487 matching lines @@
   if (gtk_window_get_modal(GTK_WINDOW(dialog))) {
     // Work around a KDE 3 window manager bug.
     scoped_ptr<base::Environment> env(base::Environment::Create());
     if (base::nix::DESKTOP_ENVIRONMENT_KDE3 ==
         base::nix::GetDesktopEnvironment(env.get()))
       gtk_window_set_skip_taskbar_hint(GTK_WINDOW(dialog), FALSE);
   }
 }
 
 }  // namespace gtk_util