Add EventTargeterDelegate for EventTargeter in mus-ws.

services/ui/ws/event_dispatcher.cc

Index: services/ui/ws/event_dispatcher.cc
diff --git a/services/ui/ws/event_dispatcher.cc b/services/ui/ws/event_dispatcher.cc
index c6e6897508347096389172210d6d3e9b91594479..56342211ce61b49ae3213181842baedea51d6cfa 100644
--- a/services/ui/ws/event_dispatcher.cc
+++ b/services/ui/ws/event_dispatcher.cc
@@ -47,8 +47,7 @@ EventDispatcher::EventDispatcher(EventDispatcherDelegate* delegate)
       capture_window_client_id_(kInvalidClientId),
       modal_window_controller_(this),
       event_targeter_(
-          base::MakeUnique<EventTargeter>(delegate_,
-                                          &modal_window_controller_)),
+          base::MakeUnique<EventTargeter>(this, &modal_window_controller_)),
       mouse_button_down_(false),
       mouse_cursor_source_window_(nullptr),
       mouse_cursor_in_non_client_area_(false) {}
@@ -317,6 +316,12 @@ void EventDispatcher::ProcessEvent(const ui::Event& event,
   return;
 }
 
+ServerWindow* EventDispatcher::GetRootWindowContaining(
+    gfx::Point* location_in_display,
+    int64_t* display_id) {
+  return delegate_->GetRootWindowContaining(location_in_display, display_id);
+}
+
 void EventDispatcher::SetMouseCursorSourceWindow(ServerWindow* window) {
   if (mouse_cursor_source_window_ == window)
     return;