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

chrome/browser/ui/gtk/tabs/dragged_tab_controller_gtk.cc

Index: chrome/browser/ui/gtk/tabs/dragged_tab_controller_gtk.cc
diff --git a/chrome/browser/ui/gtk/tabs/dragged_tab_controller_gtk.cc b/chrome/browser/ui/gtk/tabs/dragged_tab_controller_gtk.cc
index bfb1a1077c92547e238b5ebe0650344dd1b2c3cf..e5896a8f351265fe2deed38d2f8511adb2980050 100644
--- a/chrome/browser/ui/gtk/tabs/dragged_tab_controller_gtk.cc
+++ b/chrome/browser/ui/gtk/tabs/dragged_tab_controller_gtk.cc
@@ -505,9 +505,7 @@ void DraggedTabControllerGtk::Detach() {
 
 gfx::Point DraggedTabControllerGtk::ConvertScreenPointToTabStripPoint(
     TabStripGtk* tabstrip, const gfx::Point& screen_point) {
-  gfx::Point tabstrip_screen_point =
-      ui::GetWidgetScreenPosition(tabstrip->tabstrip_.get());
-  return screen_point.Subtract(tabstrip_screen_point);
+  return screen_point - ui::GetWidgetScreenOffset(tabstrip->tabstrip_.get());
 }
 
 gfx::Rect DraggedTabControllerGtk::GetDraggedViewTabStripBounds(
@@ -817,8 +815,7 @@ gfx::Rect DraggedTabControllerGtk::GetAnimateBounds() {
   gfx::Rect bounds = tab->GetRequisition();
   GtkWidget* widget = tab->widget();
   GtkWidget* parent = gtk_widget_get_parent(widget);
-  gfx::Point point = ui::GetWidgetScreenPosition(parent);
-  bounds.Offset(point);
+  bounds.Offset(ui::GetWidgetScreenOffset(parent));
 
   return gfx::Rect(bounds.x(), bounds.y(),
                    dragged_view_->GetTotalWidthInTabStrip(), bounds.height());