Add a new GetSystemColor method to native theme.

ui/gfx/native_theme_win.h

Index: ui/gfx/native_theme_win.h
diff --git a/ui/gfx/native_theme_win.h b/ui/gfx/native_theme_win.h
index 56be1db7a8be998040bb81ac750e7ba5100a9f94..d3110d7008cb3224e2c48ae213945a2f5c629bad 100644
--- a/ui/gfx/native_theme_win.h
+++ b/ui/gfx/native_theme_win.h
@@ -16,6 +16,7 @@
 #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"
@@ -96,6 +97,8 @@ class UI_EXPORT NativeThemeWin : public NativeTheme {
                          bool fill_content_area,
                          bool draw_edges) const;
 
+  virtual SkColor GetSystemColor(ColorId color_id) const OVERRIDE;
+
  private:
   NativeThemeWin();
   ~NativeThemeWin();
@@ -103,12 +106,12 @@ class UI_EXPORT NativeThemeWin : public NativeTheme {
   // 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,