mus: Let clients set the cursor of their window.

components/mus/ws/event_dispatcher.h

Index: components/mus/ws/event_dispatcher.h
diff --git a/components/mus/ws/event_dispatcher.h b/components/mus/ws/event_dispatcher.h
index bbd2badce05cc8188c60cb9e6f660d5cc5e29568..1ee39735e2e8a0274a1ce8aa2c730acd0478a82a 100644
--- a/components/mus/ws/event_dispatcher.h
+++ b/components/mus/ws/event_dispatcher.h
@@ -33,6 +33,11 @@ class EventDispatcher : public ServerWindowObserver {
 
   void set_surface_id(cc::SurfaceId surface_id) { surface_id_ = surface_id; }
 
+  // Retrieves the ServerWindow of the last mouse move.
+  ServerWindow* last_targeted_window() const {
+    return last_pointer_target_window_;
+  }
+
   void AddAccelerator(uint32_t id, mojom::EventMatcherPtr event_matcher);
   void RemoveAccelerator(uint32_t id);
 
@@ -91,6 +96,7 @@ class EventDispatcher : public ServerWindowObserver {
 
   EventDispatcherDelegate* delegate_;
   ServerWindow* root_;
+  ServerWindow* last_pointer_target_window_;

[sky, 2015/12/02 21:42:35]

As this is specific to a mouse, name it last_mouse_target_window_.

 
   cc::SurfaceId surface_id_;