Add a new GetSystemColor method to native theme.

ui/gfx/native_theme_win.h

 // Copyright (c) 2011 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.
 //
 // A wrapper class for working with custom XP/Vista themes provided in
 // uxtheme.dll.  This is a singleton class that can be grabbed using
 // NativeThemeWin::instance().
 // For more information on visual style parts and states, see:
 // http://msdn.microsoft.com/library/default.asp?url=/library/en-us/shellcc/platform/commctls/userex/topics/partsandstates.asp
 
 #ifndef UI_GFX_NATIVE_THEME_WIN_H_
 #define UI_GFX_NATIVE_THEME_WIN_H_
 #pragma once
 
 #include <windows.h>
 #include <uxtheme.h>
 
 #include "base/basictypes.h"
+#include "base/compiler_specific.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/native_theme.h"
 #include "ui/gfx/size.h"
 
 class SkCanvas;
 
 namespace gfx {
 
 // Windows implementation of native theme class.
 //
@@ skipping 60 matching lines @@
 
   HRESULT PaintTextField(HDC hdc,
                          int part_id,
                          int state_id,
                          int classic_state,
                          RECT* rect,
                          COLORREF color,
                          bool fill_content_area,
                          bool draw_edges) const;
 
+  virtual SkColor GetSystemColor(ColorId color_id) const OVERRIDE;
+
  private:
   NativeThemeWin();
   ~NativeThemeWin();
 
   // NativeTheme Implementation:
   virtual gfx::Size GetPartSize(Part part,
                                 State state,
-                                const ExtraParams& extra) const;
+                                const ExtraParams& extra) const OVERRIDE;
   virtual void Paint(SkCanvas* canvas,
                      Part part,
                      State state,
                      const gfx::Rect& rect,
-                     const ExtraParams& extra) const;
+                     const ExtraParams& extra) const OVERRIDE;
 
   void PaintToNonPlatformCanvas(SkCanvas* canvas,
                                 Part part,
                                 State state,
                                 const gfx::Rect& rect,
                                 const ExtraParams& extra) const;
 
   HRESULT GetThemePartSize(ThemeName themeName,
                            HDC hdc,
                            int part_id,
@@ skipping 198 matching lines @@
 
   // A cache of open theme handles.
   mutable HANDLE theme_handles_[LAST];
 
   DISALLOW_COPY_AND_ASSIGN(NativeThemeWin);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_NATIVE_THEME_WIN_H_