input-device: add enter/leave events generation for touch events

This patch brings 'enter-event' and 'leave-event' generation for touch
based devices. This leads to adding a new API to retrieve coordinates
of a touch point.

https://bugzilla.gnome.org/show_bug.cgi?id=679797

clutter/deprecated/clutter-input-device.h

@@ -0,0 +1,41 @@
+/*
+ * Clutter.
+ *
+ * An OpenGL based 'interactive canvas' library.
+ *
+ * Copyright © 2009, 2010, 2011  Intel Corp.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Emmanuele Bassi <ebassi@linux.intel.com>
+ */
+#if !defined(__CLUTTER_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
+#error "Only <clutter/clutter.h> can be included directly."
+#endif
+
+#ifndef __CLUTTER_INPUT_DEVICE_DEPRECATED_H__
+#define __CLUTTER_INPUT_DEVICE_DEPRECATED_H__
+
+#include <clutter/clutter-input-device.h>
+
+G_BEGIN_DECLS
+
+CLUTTER_DEPRECATED_IN_1_12_FOR(clutter_input_device_get_coords)
+void clutter_input_device_get_device_coords  (ClutterInputDevice  *device,
+                                              gint                *x,
+                                              gint                *y);
+
+G_END_DECLS
+
+#endif /* __CLUTTER_INPUT_DEVICE_DEPRECATED_H__ */