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

ui/views/widget/x11_desktop_window_move_client.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/widget/x11_desktop_window_move_client.h"
 
 #include <X11/Xlib.h>
 // Get rid of a macro from Xlib.h that conflicts with Aura's RootWindow class.
 #undef RootWindow
 
@@ skipping 53 matching lines @@
 }
 
 ui::EventResult X11DesktopWindowMoveClient::PreHandleGestureEvent(
     aura::Window* target,
     ui::GestureEvent* event) {
   return ui::ER_UNHANDLED;
 }
 
 aura::client::WindowMoveResult X11DesktopWindowMoveClient::RunMoveLoop(
     aura::Window* source,
-    const gfx::Point& drag_offset) {
+    const gfx::Vector2d& drag_offset) {
   DCHECK(!in_move_loop_);  // Can only handle one nested loop at a time.
   in_move_loop_ = true;
   window_offset_ = drag_offset;
 
   source->GetRootWindow()->ShowRootWindow();
 
   Display* display = base::MessagePumpAuraX11::GetDefaultXDisplay();
   XGrabServer(display);
   XUngrabPointer(display, CurrentTime);
 
@@ skipping 31 matching lines @@
 
   // Ungrab before we let go of the window.
   Display* display = base::MessagePumpAuraX11::GetDefaultXDisplay();
   XUngrabPointer(display, CurrentTime);
 
   in_move_loop_ = false;
   quit_closure_.Run();
 }
 
 }  // namespace views