Native themes: Add menu separator part

ui/native_theme/native_theme_base.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_NATIVE_THEME_NATIVE_THEME_BASE_H_
 #define UI_NATIVE_THEME_NATIVE_THEME_BASE_H_
 
 #include <memory>
 
 #include "base/compiler_specific.h"
@@ skipping 86 matching lines @@
       SkCanvas* canvas,
       const gfx::Size& size,
       const MenuBackgroundExtraParams& menu_background) const;
 
   virtual void PaintMenuItemBackground(
       SkCanvas* canvas,
       State state,
       const gfx::Rect& rect,
       const MenuItemExtraParams& menu_item) const;
 
+  virtual void PaintMenuSeparator(
+      SkCanvas* canvas,
+      State state,
+      const gfx::Rect& rect,
+      const MenuSeparatorExtraParams& menu_separator) const;
+
   virtual void PaintSliderTrack(
       SkCanvas* canvas,
       State state,
       const gfx::Rect& rect,
       const SliderExtraParams& slider) const;
 
   virtual void PaintSliderThumb(
       SkCanvas* canvas,
       State state,
       const gfx::Rect& rect,
@@ skipping 78 matching lines @@
 
   // The length of the arrow buttons, 0 means no buttons are drawn.
   int scrollbar_button_length_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeThemeBase);
 };
 
 }  // namespace ui
 
 #endif  // UI_NATIVE_THEME_NATIVE_THEME_BASE_H_