mus: Fix event transformation in client code.

ui/aura/test/x11_event_sender.cc

Index: ui/aura/test/x11_event_sender.cc
diff --git a/ui/aura/test/x11_event_sender.cc b/ui/aura/test/x11_event_sender.cc
index bc58502d18a91c2c0c051b7dc5c0807ef3f5c70c..3116a5ca38d3410a6271ee8d4490ac836757b9ff 100644
--- a/ui/aura/test/x11_event_sender.cc
+++ b/ui/aura/test/x11_event_sender.cc
@@ -34,9 +34,12 @@ void PostEventToWindowTreeHost(const XEvent& xevent, WindowTreeHost* host) {
       event.xmotion.time = CurrentTime;
 
       gfx::Point point(event.xmotion.x, event.xmotion.y);
-      host->ConvertPointToNativeScreen(&point);
-      event.xmotion.x_root = point.x();
-      event.xmotion.y_root = point.y();
+      gfx::Point root_point = point;
+      host->ConvertPointToNativeScreen(&root_point);
+      event.xmotion.x_root = root_point.x();
+      event.xmotion.y_root = root_point.y();
+      LOG(ERROR) << "Posting at " << point.ToString() << " vs. "
+          << root_point.ToString();
     }
     default:
       break;