Aura/GTK integration: Create a small stub library that can talk to GTK.

chrome/browser/ui/libgtk2ui/chrome_gtk_frame.h

+// Copyright (c) 2011 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_LIBGTK2UI_CHROME_GTK_FRAME_H_
+#define CHROME_BROWSER_UI_LIBGTK2UI_CHROME_GTK_FRAME_H_
+#pragma once
+
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
+
+// This file declares two subclasses of GtkWindow for easier gtk+ theme
+// integration.
+//
+// The first is "MetaFrames," which is (was?) the name of a gobject class in
+// the metacity window manager. To actually get at those values, we need to
+// have an object whose gobject class name string matches the definitions in
+// the gtkrc file. MetaFrames derives from GtkWindow.
+//
+// Metaframes can not be instantiated. It has no constructor; instantiate
+// ChromeGtkFrame instead.
+typedef struct _MetaFrames       MetaFrames;
+typedef struct _MetaFramesClass  MetaFramesClass;
+
+struct _MetaFrames {
+  GtkWindow window;
+};
+
+struct _MetaFramesClass {
+  GtkWindowClass parent_class;
+};
+
+
+// The second is ChromeGtkFrame, which defines a number of optional style
+// properties so theme authors can control how chromium appears in gtk-theme
+// mode.  It derives from MetaFrames in chrome so older themes that declare a
+// MetaFrames theme will still work. New themes should target this class.
+typedef struct _ChromeGtkFrame       ChromeGtkFrame;
+typedef struct _ChromeGtkFrameClass  ChromeGtkFrameClass;
+
+struct _ChromeGtkFrame {
+  MetaFrames frames;
+};
+
+struct _ChromeGtkFrameClass {
+  MetaFramesClass frames_class;
+};
+
+// Creates a GtkWindow object the the class name "ChromeGtkFrame".
+GtkWidget* chrome_gtk_frame_new();
+
+G_END_DECLS
+
+#endif  // CHROME_BROWSER_UI_LIBGTK2UI_CHROME_GTK_FRAME_H_