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

ui/views/widget/desktop_root_window_host_linux.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/desktop_root_window_host_linux.h"
 
 #include <X11/extensions/XInput2.h>
 #include <X11/Xatom.h>
 #include <X11/Xutil.h>
 
@@ skipping 507 matching lines @@
   // it sets the focus to our |content_window_|, which will trigger a cascade
   // of focus changes into views.
   if (content_window_ && content_window_->GetFocusManager() &&
       content_window_->Contains(
           content_window_->GetFocusManager()->GetFocusedWindow())) {
     content_window_->GetFocusManager()->SetFocusedWindow(content_window_, NULL);
   }
 }
 
 Widget::MoveLoopResult DesktopRootWindowHostLinux::RunMoveLoop(
-    const gfx::Point& drag_offset) {
+    const gfx::Vector2d& drag_offset) {
   SetCapture();
 
   if (x11_window_move_client_->RunMoveLoop(content_window_, drag_offset) ==
       aura::client::MOVE_SUCCESSFUL)
     return Widget::MOVE_LOOP_SUCCESSFUL;
 
   return Widget::MOVE_LOOP_CANCELED;
 }
 
 void DesktopRootWindowHostLinux::EndMoveLoop() {
@@ skipping 551 matching lines @@
 DesktopRootWindowHost* DesktopRootWindowHost::Create(
     internal::NativeWidgetDelegate* native_widget_delegate,
     DesktopNativeWidgetAura* desktop_native_widget_aura,
     const gfx::Rect& initial_bounds) {
   return new DesktopRootWindowHostLinux(native_widget_delegate,
                                         desktop_native_widget_aura,
                                         initial_bounds);
 }
 
 }  // namespace views