Factor more colors into NativeTheme.

ui/gfx/native_theme_aura.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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_GFX_NATIVE_THEME_AURA_H_
 #define UI_GFX_NATIVE_THEME_AURA_H_
 #pragma once
 
 #include <map>
 
 #include "base/compiler_specific.h"
 #include "ui/gfx/native_theme_base.h"
 #include "ui/gfx/rect.h"
 
 class SkBitmap;
 
 namespace gfx {
 
 // Aura implementation of native theme support.
 class NativeThemeAura : public NativeThemeBase {
  public:
   static const NativeThemeAura* instance();
 
  private:
   NativeThemeAura();
   virtual ~NativeThemeAura();
 
+  // NativeTheme overrides
+  virtual SkColor GetSystemColor(ColorId color_id) const OVERRIDE;
+
   // NativeThemeBase overrides
   virtual void PaintMenuPopupBackground(
       SkCanvas* canvas,
       State state,
       const gfx::Rect& rect,
       const MenuListExtraParams& menu_list) const OVERRIDE;
 
   virtual void PaintScrollbarTrack(
       SkCanvas* canvas,
       Part part,
@@ skipping 19 matching lines @@
   // ownership of the pointers.
   typedef std::map<int, SkBitmap*> SkImageMap;
   mutable SkImageMap horizontal_bitmaps_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeThemeAura);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_NATIVE_THEME_AURA_H_