LibGtkUi: Partition NativeThemeGtk into NativeThemeGtk2 and NativeThemeGtk3

chrome/browser/ui/libgtkui/gtk_ui.h

 // Copyright (c) 2013 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 CHROME_BROWSER_UI_LIBGTKUI_GTK_UI_H_
 #define CHROME_BROWSER_UI_LIBGTKUI_GTK_UI_H_
 
 #include <map>
 #include <memory>
 #include <vector>
@@ skipping 128 matching lines @@
   // Returns a tint that's the color of the current highlighted text in an
   // entry.
   void GetSelectedEntryForegroundHSL(color_utils::HSL* tint) const;
 
   // Gets a color for the background of the prominent button.
   SkColor GetProminentButtonBgColor(int gtk_state) const;
 
   // Updates |default_font_*|.
   void UpdateDefaultFont();
 
+  // Gets a ChromeGtkFrame theme color; returns true on success.  No-op on gtk3.
+  bool GetChromeStyleColor(const char* sytle_property,
+                           SkColor* ret_color) const;
+
+  ui::NativeTheme* native_theme_;
+
+  // A GtkWindow object with the class "ChromeGtkFrame".
+  GtkWidget* fake_window_;
+
   // Colors calculated by LoadGtkValues() that are given to the
   // caller while |use_gtk_| is true.
   ColorMap colors_;
 
   // Colors used to tint certain icons.
   color_utils::HSL button_tint_;
   color_utils::HSL entry_tint_;
   color_utils::HSL selected_entry_tint_;
 
   // Colors that we pass to WebKit. These are generated each time the theme
@@ skipping 48 matching lines @@
 }  // namespace libgtkui
 
 // Access point to the GTK2 desktop system. This should be the only symbol that
 // is exported in the library; everything else should be used through the
 // interface, because eventually this .so will be loaded through dlopen at
 // runtime so our main binary can conditionally load GTK2 or GTK3 or EFL or
 // QT or whatever.
 LIBGTKUI_EXPORT views::LinuxUI* BuildGtk2UI();
 
 #endif  // CHROME_BROWSER_UI_LIBGTKUI_GTK_UI_H_