clutter: Add ClutterDeviceManager::tool-changed signal

This signal will notify whenever a device changed tool.

https://bugzilla.gnome.org/show_bug.cgi?id=773779

clutter/clutter/clutter-device-manager.c

@@ -48,6 +48,7 @@
 #include "clutter-private.h"
 #include "clutter-stage-private.h"
 #include "clutter-virtual-input-device.h"
+#include "clutter-input-device-tool.h"
 
 struct _ClutterDeviceManagerPrivate
 {
@@ -70,6 +71,7 @@ enum
 {
   DEVICE_ADDED,
   DEVICE_REMOVED,
+  TOOL_CHANGED,
 
   LAST_SIGNAL
 };
@@ -184,6 +186,16 @@ clutter_device_manager_class_init (ClutterDeviceManagerClass *klass)
                   _clutter_marshal_VOID__OBJECT,
                   G_TYPE_NONE, 1,
                   CLUTTER_TYPE_INPUT_DEVICE);
+
+  manager_signals[TOOL_CHANGED] =
+    g_signal_new (I_("tool-changed"),
+                  G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_LAST,
+                  0, NULL, NULL,
+                  _clutter_marshal_VOID__OBJECT_OBJECT,
+                  G_TYPE_NONE, 2,
+                  CLUTTER_TYPE_INPUT_DEVICE,
+                  CLUTTER_TYPE_INPUT_DEVICE_TOOL);
 }
 
 static void

clutter/clutter/clutter-marshal.list

@@ -23,6 +23,7 @@ VOID:OBJECT
 VOID:OBJECT,FLAGS
 VOID:OBJECT,FLOAT,FLOAT
 VOID:OBJECT,FLOAT,FLOAT,FLAGS
+VOID:OBJECT,OBJECT
 VOID:OBJECT,PARAM
 VOID:OBJECT,POINTER
 VOID:OBJECT,UINT