Desktop Aura: Allow tab drags out of window.

ui/aura/root_window_host_win.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 UI_AURA_ROOT_WINDOW_HOST_WIN_H_
 #define UI_AURA_ROOT_WINDOW_HOST_WIN_H_
 
 #include "base/compiler_specific.h"
 #include "ui/aura/root_window_host.h"
 #include "ui/base/win/window_impl.h"
 
 namespace ui {
 class ViewProp;
 }
 
 namespace aura {
 
 class RootWindowHostWin : public RootWindowHost, public ui::WindowImpl {
  public:
   RootWindowHostWin(RootWindowHostDelegate* delegate,
                     const gfx::Rect& bounds);
   virtual ~RootWindowHostWin();
 
   // RootWindowHost:
   virtual RootWindow* GetRootWindow() OVERRIDE;
   virtual gfx::AcceleratedWidget GetAcceleratedWidget() OVERRIDE;
   virtual void Show() OVERRIDE;
+  virtual void Hide() OVERRIDE;
   virtual void ToggleFullScreen() OVERRIDE;
   virtual gfx::Rect GetBounds() const OVERRIDE;
   virtual void SetBounds(const gfx::Rect& bounds) OVERRIDE;
   virtual gfx::Point GetLocationOnNativeScreen() const OVERRIDE;
   virtual void SetCapture() OVERRIDE;
   virtual void ReleaseCapture() OVERRIDE;
   virtual void SetCursor(gfx::NativeCursor cursor) OVERRIDE;
   virtual void ShowCursor(bool show) OVERRIDE;
   virtual bool QueryMouseLocation(gfx::Point* location_return) OVERRIDE;
   virtual bool ConfineCursorToRootWindow() OVERRIDE;
@@ skipping 45 matching lines @@
   DWORD saved_window_ex_style_;
 
   scoped_ptr<ui::ViewProp> prop_;
 
   DISALLOW_COPY_AND_ASSIGN(RootWindowHostWin);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_ROOT_WINDOW_HOST_WIN_H_