Update Windows UI on system color changes.

chrome/browser/ui/libgtk2ui/native_theme_gtk2.h

 // Copyright (c) 2013 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 CHROME_BROWSER_UI_LIBGTK2UI_NATIVE_THEME_GTK2_H_
 #define CHROME_BROWSER_UI_LIBGTK2UI_NATIVE_THEME_GTK2_H_
 
 #include "chrome/browser/ui/libgtk2ui/owned_widget_gtk2.h"
 #include "ui/native_theme/native_theme_base.h"
 
@@ skipping 15 matching lines @@
   virtual void PaintMenuPopupBackground(
       SkCanvas* canvas,
       const gfx::Size& size,
       const MenuBackgroundExtraParams& menu_background) const OVERRIDE;
   virtual void PaintMenuItemBackground(
       SkCanvas* canvas,
       State state,
       const gfx::Rect& rect,
       const MenuListExtraParams& menu_list) const OVERRIDE;
 
+  // A public helper to notify observers of native theme changes.
+  void NotifyNativeThemeObservers();
+
  private:
   NativeThemeGtk2();
   virtual ~NativeThemeGtk2();
 
   // Implementation of GetSystemColor.
   GdkColor GetSystemGdkColor(ColorId color_id) const;
 
   // Returns styles associated with various widget types.
   GtkWidget* GetRealizedWindow() const;
   GtkStyle* GetWindowStyle() const;
@@ skipping 12 matching lines @@
 
   mutable OwnedWidgetGtk fake_menu_;
   mutable GtkWidget* fake_menu_item_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeThemeGtk2);
 };
 
 }  // namespace libgtk2ui
 
 #endif  // CHROME_BROWSER_UI_LIBGTK2UI_NATIVE_THEME_GTK2_H_