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

ui/views/controls/menu/menu_controller.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/views/controls/menu/menu_controller.h"
 
 #include "base/i18n/case_conversion.h"
 #include "base/i18n/rtl.h"
 #include "base/run_loop.h"
 #include "base/time.h"
@@ skipping 432 matching lines @@
 
 void MenuController::OnMouseDragged(SubmenuView* source,
                                     const ui::MouseEvent& event) {
   MenuPart part = GetMenuPart(source, event.location());
   UpdateScrolling(part);
 
   if (!blocking_run_)
     return;
 
   if (possible_drag_) {
-    if (View::ExceededDragThreshold(event.x() - press_pt_.x(),
-                                    event.y() - press_pt_.y())) {
+    if (View::ExceededDragThreshold(event.location() - press_pt_))
       StartDrag(source, press_pt_);
-    }
     return;
   }
   MenuItemView* mouse_menu = NULL;
   if (part.type == MenuPart::MENU_ITEM) {
     if (!part.menu)
       part.menu = source->GetMenuItem();
     else
       mouse_menu = part.menu;
     SetSelection(part.menu ? part.menu : state_.item, SELECTION_OPEN_SUBMENU);
   } else if (part.type == MenuPart::NONE) {
@@ skipping 385 matching lines @@
   View::ConvertPointToScreen(source->GetScrollViewContainer(), &press_loc);
   View::ConvertPointToTarget(NULL, item, &press_loc);
   gfx::Point widget_loc(press_loc);
   View::ConvertPointToWidget(item, &widget_loc);
   scoped_ptr<gfx::Canvas> canvas(views::GetCanvasForDragImage(
       source->GetWidget(), gfx::Size(item->width(), item->height())));
   item->PaintButton(canvas.get(), MenuItemView::PB_FOR_DRAG);
 
   OSExchangeData data;
   item->GetDelegate()->WriteDragData(item, &data);
-  drag_utils::SetDragImageOnDataObject(*canvas, item->size(), press_loc,
+  drag_utils::SetDragImageOnDataObject(*canvas, item->size(),
+                                       press_loc.OffsetFromOrigin(),
                                        &data);
   StopScrolling();
   int drag_ops = item->GetDelegate()->GetDragOperations(item);
   drag_in_progress_ = true;
   item->GetWidget()->RunShellDrag(NULL, data, widget_loc, drag_ops);
   drag_in_progress_ = false;
 
   if (GetActiveInstance() == this) {
     if (showing_) {
       // We're still showing, close all menus.
@@ skipping 1264 matching lines @@
 
 gfx::Screen* MenuController::GetScreen() {
 #if defined(USE_AURA)
   return gfx::Screen::GetScreenFor(root_window_);
 #else
   return gfx::Screen::GetNativeScreen();
 #endif
 }
 
 }  // namespace views