Find display root ServerWindow for located events in mus.

services/ui/ws/window_manager_state.h

Index: services/ui/ws/window_manager_state.h
diff --git a/services/ui/ws/window_manager_state.h b/services/ui/ws/window_manager_state.h
index 685f123645aab6de6c446f482d025c820c2f281f..04386271d90b8784f44b83bf33b39a1d4db5ba84 100644
--- a/services/ui/ws/window_manager_state.h
+++ b/services/ui/ws/window_manager_state.h
@@ -8,6 +8,7 @@
 #include <stdint.h>
 
 #include <memory>
+#include <queue>
 #include <vector>
 
 #include "base/memory/weak_ptr.h"
@@ -190,7 +191,7 @@ class WindowManagerState : public EventDispatcherDelegate {
                                   Accelerator* accelerator) override;
   ClientSpecificId GetEventTargetClientId(const ServerWindow* window,
                                           bool in_nonclient_area) override;
-  ServerWindow* GetRootWindowContaining(const gfx::Point& location) override;
+  ServerWindow* GetRootWindowContaining(gfx::Point* location) override;
   void OnEventTargetNotFound(const ui::Event& event) override;
 
   // The single WindowTree this WindowManagerState is associated with.