Add xdg mime support on Linux.

base/third_party/xdg_mime/xdgmimeicon.h

Index: base/third_party/xdg_mime/xdgmimeicon.h
===================================================================
--- base/third_party/xdg_mime/xdgmimeicon.h	(revision 0)
+++ base/third_party/xdg_mime/xdgmimeicon.h	(revision 0)
@@ -0,0 +1,50 @@
+/* -*- mode: C; c-file-style: "gnu" -*- */
+/* xdgmimeicon.h: Private file.  Datastructure for storing the aliases.
+ *
+ * More info can be found at http://www.freedesktop.org/standards/
+ *
+ * Copyright (C) 2008  Red Hat, Inc.
+ *
+ * Licensed under the Academic Free License version 2.0
+ * Or under the following terms:
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __XDG_MIME_ICON_H__
+#define __XDG_MIME_ICON_H__
+
+#include "xdgmime.h"
+
+typedef struct XdgIconList XdgIconList;
+
+#ifdef XDG_PREFIX
+#define _xdg_mime_icon_read_from_file        XDG_ENTRY(icon_read_from_file)
+#define _xdg_mime_icon_list_new              XDG_ENTRY(icon_list_new)
+#define _xdg_mime_icon_list_free             XDG_ENTRY(icon_list_free)
+#define _xdg_mime_icon_list_lookup           XDG_ENTRY(icon_list_lookup)
+#define _xdg_mime_icon_list_dump             XDG_ENTRY(icon_list_dump)
+#endif
+
+void          _xdg_mime_icon_read_from_file (XdgIconList *list,
+					    const char   *file_name);
+XdgIconList  *_xdg_mime_icon_list_new       (void);
+void          _xdg_mime_icon_list_free      (XdgIconList *list);
+const char   *_xdg_mime_icon_list_lookup    (XdgIconList *list,
+					     const char  *mime);
+void          _xdg_mime_icon_list_dump      (XdgIconList *list);
+
+#endif /* __XDG_MIME_ICON_H__ */