Gtk3: Fix separator color on Gtk3.20

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 183 matching lines @@
 aura::Window* GetAuraTransientParent(GtkWidget* dialog) {
   return reinterpret_cast<aura::Window*>(
       g_object_get_data(G_OBJECT(dialog), kAuraTransientParent));
 }
 
 void ClearAuraTransientParent(GtkWidget* dialog) {
   g_object_set_data(G_OBJECT(dialog), kAuraTransientParent, NULL);
 }
 
 #if GTK_MAJOR_VERSION > 2
+bool GtkVersionCheck(int major, int minor, int micro) {
+  static int actual_major = gtk_get_major_version();
+  if (actual_major > major)
+    return true;
+  else if (actual_major < major)
+    return false;
+
+  static int actual_minor = gtk_get_minor_version();
+  if (actual_minor > minor)
+    return true;
+  else if (actual_minor < minor)
+    return false;
+
+  static int actual_micro = gtk_get_micro_version();
+  if (actual_micro >= micro)
+    return true;
+  else
+    return false;
+}
+
 ScopedStyleContext AppendNode(GtkStyleContext* context,
                               const std::string& css_node) {
   GtkWidgetPath* path =
       context ? gtk_widget_path_copy(gtk_style_context_get_path(context))
               : gtk_widget_path_new();
 
   enum {
     CSS_TYPE,
     CSS_NAME,
     CSS_CLASS,
@@ skipping 36 matching lines @@
           break;
         case ':':
           part_type = CSS_PSEUDOCLASS;
           break;
         default:
           NOTREACHED();
       }
     } else {
       switch (part_type) {
         case CSS_NAME: {
-          if (gtk_get_major_version() > 3 ||
-              (gtk_get_major_version() == 3 && gtk_get_minor_version() >= 20)) {
+          if (GtkVersionCheck(3, 20)) {
             static auto* _gtk_widget_path_iter_set_object_name =
                 reinterpret_cast<void (*)(GtkWidgetPath*, gint, const char*)>(
                     dlsym(GetGtk3SharedLibrary(),
                           "gtk_widget_path_iter_set_object_name"));
             DCHECK(_gtk_widget_path_iter_set_object_name);
             _gtk_widget_path_iter_set_object_name(path, -1, t.token().c_str());
           } else {
             gtk_widget_path_iter_add_class(path, -1, t.token().c_str());
           }
           break;
@@ skipping 166 matching lines @@
 
   AddBorders(context);
   PixelSurface surface;
   RenderBackground(surface.cairo(), context);
   gtk_render_frame(context, surface.cairo(), 0, 0, 1, 1);
   return surface.GetPixelValue();
 }
 #endif
 
 }  // namespace libgtkui