Aura desktop: Fix tab dragging within a single chrome window.

ui/aura/root_window.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_H_
 #define UI_AURA_ROOT_WINDOW_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 66 matching lines @@
 class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
                                public ui::CompositorObserver,
                                public Window,
                                public ui::GestureEventHelper,
                                public ui::LayerAnimationObserver,
                                public aura::client::CaptureDelegate {
  public:
   explicit RootWindow(const gfx::Rect& initial_bounds);
   virtual ~RootWindow();
 
+  static RootWindow* GetForAcceleratedWidget(gfx::AcceleratedWidget widget);
+
   static void set_hide_host_cursor(bool hide) {
     hide_host_cursor_ = hide;
   }
   static bool hide_host_cursor() {
     return hide_host_cursor_;
   }
 
   ui::Compositor* compositor() { return compositor_.get(); }
   gfx::Point last_mouse_location() const { return last_mouse_location_; }
   gfx::NativeCursor last_cursor() const { return last_cursor_; }
@@ skipping 297 matching lines @@
 
   CompositorLock* compositor_lock_;
   bool draw_on_compositor_unlock_;
 
   DISALLOW_COPY_AND_ASSIGN(RootWindow);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_ROOT_WINDOW_H_