Landing http://codereview.chromium.org/3387008 for sadrul:

third_party/undoview/undo_manager.h

Index: third_party/undoview/undo_manager.h
diff --git a/third_party/undoview/undo_manager.h b/third_party/undoview/undo_manager.h
new file mode 100644
index 0000000000000000000000000000000000000000..9be582ccaadcc48ba5d0ad4bbaefbf5ad8f30267
--- /dev/null
+++ b/third_party/undoview/undo_manager.h
@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 1998, 1999 Alex Roberts, Evan Lawrence
+ * Copyright (C) 2000, 2001 Chema Celorio, Paolo Maggi
+ * Copyright (C) 2002, 2003 Paolo Maggi
+ *
+ * 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 2.1 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef CHROME_BROWSER_AUTOCOMPLETE_UNDO_MANAGER_H_
+#define CHROME_BROWSER_AUTOCOMPLETE_UNDO_MANAGER_H_
+
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
+
+#define GTK_SOURCE_TYPE_UNDO_MANAGER            (gtk_source_undo_manager_get_type())
+
+#define GTK_SOURCE_UNDO_MANAGER(obj)            \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj), GTK_SOURCE_TYPE_UNDO_MANAGER, GtkSourceUndoManager))
+
+#define GTK_SOURCE_UNDO_MANAGER_CLASS(klass)    \
+  (G_TYPE_CHECK_CLASS_CAST((klass), GTK_SOURCE_TYPE_UNDO_MANAGER, GtkSourceUndoManagerClass))
+
+#define GTK_SOURCE_IS_UNDO_MANAGER(obj)         \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj), GTK_SOURCE_TYPE_UNDO_MANAGER))
+
+#define GTK_SOURCE_IS_UNDO_MANAGER_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass), GTK_SOURCE_TYPE_UNDO_MANAGER))
+
+#define GTK_SOURCE_UNDO_MANAGER_GET_CLASS(obj)  \
+  (G_TYPE_INSTANCE_GET_CLASS((obj), GTK_SOURCE_TYPE_UNDO_MANAGER, GtkSourceUndoManagerClass))
+
+typedef struct _GtkSourceUndoManager          GtkSourceUndoManager;
+typedef struct _GtkSourceUndoManagerClass   GtkSourceUndoManagerClass;
+
+typedef struct _GtkSourceUndoManagerPrivate   GtkSourceUndoManagerPrivate;
+
+struct _GtkSourceUndoManager
+{
+  GObject base;
+
+  GtkSourceUndoManagerPrivate *priv;
+};
+
+struct _GtkSourceUndoManagerClass
+{
+  GObjectClass parent_class;
+
+  /* Signals */
+  void (*can_undo)(GtkSourceUndoManager *um, gboolean can_undo);
+  void (*can_redo)(GtkSourceUndoManager *um, gboolean can_redo);
+};
+
+GType            gtk_source_undo_manager_get_type(void) G_GNUC_CONST;
+
+GtkSourceUndoManager*   gtk_source_undo_manager_new(GtkTextBuffer     *buffer);
+
+gboolean    gtk_source_undo_manager_can_undo(const GtkSourceUndoManager *um);
+gboolean    gtk_source_undo_manager_can_redo(const GtkSourceUndoManager *um);
+
+void      gtk_source_undo_manager_undo(GtkSourceUndoManager   *um);
+void      gtk_source_undo_manager_redo(GtkSourceUndoManager   *um);
+
+void      gtk_source_undo_manager_begin_not_undoable_action(GtkSourceUndoManager  *um);
+void      gtk_source_undo_manager_end_not_undoable_action(GtkSourceUndoManager  *um);
+
+gint      gtk_source_undo_manager_get_max_undo_levels(GtkSourceUndoManager   *um);
+void      gtk_source_undo_manager_set_max_undo_levels(GtkSourceUndoManager   *um,
+                        gint        undo_levels);
+
+G_END_DECLS
+
+#endif  // CHROME_BROWSER_AUTOCOMPLETE_UNDO_MANAGER_H_
+