Adds View::GetNativeTheme() to get the NativeTheme. The interesting

ui/views/widget/desktop_root_window_host.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_ROOT_WINDOW_HOST_H_
 #define UI_VIEWS_WIDGET_DESKTOP_ROOT_WINDOW_HOST_H_
 
 #include "ui/base/ui_base_types.h"
 #include "ui/views/views_export.h"
 #include "ui/views/widget/widget.h"
 
 namespace aura {
 class RootWindowHost;
 class Window;
 }
 
 namespace gfx {
 class ImageSkia;
 class Rect;
 }
 
+namespace ui {
+class NativeTheme;
+}
+
 namespace views {
 class DesktopNativeWidgetAura;
 namespace internal {
 class InputMethodDelegate;
 class NativeWidgetDelegate;
 }
 
 class VIEWS_EXPORT DesktopRootWindowHost {
  public:
   virtual ~DesktopRootWindowHost() {}
 
   static DesktopRootWindowHost* Create(
       internal::NativeWidgetDelegate* native_widget_delegate,
       DesktopNativeWidgetAura* desktop_native_widget_aura,
       const gfx::Rect& initial_bounds);
 
+  // Return the NativeTheme to use for |window|.
+  static ui::NativeTheme* GetNativeTheme(aura::Window* window);
+
   // Creates the aura resources associated with the native window we built.
   // Caller takes ownership of returned RootWindow.
   virtual aura::RootWindow* Init(aura::Window* content_window,
                                  const Widget::InitParams& params) = 0;
 
   virtual void Close() = 0;
   virtual void CloseNow() = 0;
 
   virtual aura::RootWindowHost* AsRootWindowHost() = 0;
 
@@ skipping 62 matching lines @@
 
   // Called when the DesktopNativeWidgetAura's aura::Window is focused and
   // blurred.
   virtual void OnNativeWidgetFocus() = 0;
   virtual void OnNativeWidgetBlur() = 0;
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_ROOT_WINDOW_HOST_H_