Find display root ServerWindow for located events in mus.

services/ui/ws/event_dispatcher_unittest.cc

Index: services/ui/ws/event_dispatcher_unittest.cc
diff --git a/services/ui/ws/event_dispatcher_unittest.cc b/services/ui/ws/event_dispatcher_unittest.cc
index e7273b4eb9db5a1dc75b39af78f7e62c81fbea71..832361d4204ca74516a4c8fff42ad534ff3ad094 100644
--- a/services/ui/ws/event_dispatcher_unittest.cc
+++ b/services/ui/ws/event_dispatcher_unittest.cc
@@ -140,7 +140,7 @@ class TestEventDispatcherDelegate : public EventDispatcherDelegate {
                                           bool in_nonclient_area) override {
     return in_nonclient_area ? kNonclientAreaId : kClientAreaId;
   }
-  ServerWindow* GetRootWindowContaining(const gfx::Point& location) override {
+  ServerWindow* GetRootWindowContaining(gfx::Point* location) override {
     return root_;
   }
   void OnEventTargetNotFound(const ui::Event& event) override {