Native themes: Add menu separator part

chrome/browser/ui/libgtkui/gtk_util.cc

 // 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.
 
 #include "chrome/browser/ui/libgtkui/gtk_util.h"
 
 #include <dlfcn.h>
 #include <gdk/gdk.h>
 #include <gdk/gdkx.h>
 #include <gtk/gtk.h>
@@ skipping 329 matching lines @@
     context = AppendNode(context, widget_type);
   }
   return context;
 }
 
 SkColor GdkRgbaToSkColor(const GdkRGBA& color) {
   return SkColorSetARGB(color.alpha * 255, color.red * 255, color.green * 255,
                         color.blue * 255);
 }
 
-SkColor GetFgColor(const char* css_selector) {
-  auto context = GetStyleContextFromCss(css_selector);
+SkColor SkColorFromStyleContext(GtkStyleContext* context) {
   GdkRGBA color;
   gtk_style_context_get_color(context, gtk_style_context_get_state(context),
                               &color);
   return GdkRgbaToSkColor(color);
 }
 
+SkColor GetFgColor(const char* css_selector) {
+  return SkColorFromStyleContext(GetStyleContextFromCss(css_selector));
+}
+
 GtkCssProvider* GetCssProvider(const char* css) {
   GtkCssProvider* provider = gtk_css_provider_new();
   GError* error = nullptr;
   gtk_css_provider_load_from_data(provider, css, -1, &error);
   DCHECK(!error);
   return provider;
 }
 
 void ApplyCssToContext(GtkStyleContext* context, GtkCssProvider* provider) {
   while (context) {
@@ skipping 113 matching lines @@
   // background color.  Only return the border color if there is one.
   SkColor border = GetBorderColor(css_selector);
   if (SkColorGetA(border))
     return border;
 
   return GetBgColor(css_selector);
 }
 #endif
 
 }  // namespace libgtkui