Desktop Aura: Allow tab drags out of window.

ash/wm/toplevel_window_event_filter.h

 // 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.
 
 #ifndef ASH_WM_TOPLEVEL_WINDOW_EVENT_FILTER_H_
 #define ASH_WM_TOPLEVEL_WINDOW_EVENT_FILTER_H_
 
 #include <set>
 
 #include "base/callback.h"
@@ skipping 36 matching lines @@
   virtual bool PreHandleMouseEvent(aura::Window* target,
                                    ui::MouseEvent* event) OVERRIDE;
   virtual ui::TouchStatus PreHandleTouchEvent(
       aura::Window* target,
       ui::TouchEvent* event) OVERRIDE;
   virtual ui::GestureStatus PreHandleGestureEvent(
       aura::Window* target,
       ui::GestureEvent* event) OVERRIDE;
 
   // Overridden form aura::client::WindowMoveClient:
-  virtual void RunMoveLoop(aura::Window* source) OVERRIDE;
+  virtual void RunMoveLoop(aura::Window* source,
+                           const gfx::Point& drag_offset) OVERRIDE;
   virtual void EndMoveLoop() OVERRIDE;
 
  protected:
   // Creates a new WindowResizer.
   virtual WindowResizer* CreateWindowResizer(aura::Window* window,
                                              const gfx::Point& point_in_parent,
                                              int window_component);
 
  private:
   enum DragCompletionStatus {
@@ skipping 28 matching lines @@
   scoped_ptr<WindowResizer> window_resizer_;
 
   base::Closure quit_closure_;
 
   DISALLOW_COPY_AND_ASSIGN(ToplevelWindowEventFilter);
 };
 
 }  // namespace aura
 
 #endif  // ASH_WM_TOPLEVEL_WINDOW_EVENT_FILTER_H_