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

ui/views/widget/desktop_native_widget_helper_aura.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_VIEWS_WIDGET_DESKTOP_NATIVE_WIDGET_HELPER_AURA_H_
 #define UI_VIEWS_WIDGET_DESKTOP_NATIVE_WIDGET_HELPER_AURA_H_
 #pragma once
 
 #include "ui/aura/root_window_observer.h"
 #include "ui/gfx/rect.h"
@@ skipping 28 matching lines @@
 
 // Implementation of non-Ash desktop integration code, allowing
 // NativeWidgetAuras to work in a traditional desktop environment.
 class VIEWS_EXPORT DesktopNativeWidgetHelperAura
     : public NativeWidgetHelperAura,
       public aura::RootWindowObserver {
  public:
   explicit DesktopNativeWidgetHelperAura(NativeWidgetAura* widget);
   virtual ~DesktopNativeWidgetHelperAura();
 
+  // In general, views/ does not care about the aura::RootWindow, even though
+  // at any join point with the native OS, we're going to be dealing in
+  // RootWindows.
+  static aura::Window* GetViewsWindowForRootWindow(aura::RootWindow* root);
+
   // Overridden from aura::NativeWidgetHelperAura:
   virtual void PreInitialize(aura::Window* window,
                              const Widget::InitParams& params) OVERRIDE;
   virtual void PostInitialize() OVERRIDE;
   virtual void ShowRootWindow() OVERRIDE;
   virtual aura::RootWindow* GetRootWindow() OVERRIDE;
   virtual gfx::Rect ModifyAndSetBounds(const gfx::Rect& bounds) OVERRIDE;
 
   // Overridden from aura::RootWindowObserver:
   virtual void OnRootWindowResized(const aura::RootWindow* root,
@@ skipping 31 matching lines @@
 #elif defined(USE_X11)
   scoped_ptr<X11WindowEventFilter> x11_window_event_filter_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(DesktopNativeWidgetHelperAura);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_NATIVE_WIDGET_HELPER_AURA_H_