Implement a MoveCursorToScreenLocation for just the window manager.

ui/aura/mus/window_tree_client.cc

Index: ui/aura/mus/window_tree_client.cc
diff --git a/ui/aura/mus/window_tree_client.cc b/ui/aura/mus/window_tree_client.cc
index 6bb5e41fc0dc6f3f97a04fe27b4ef6f500e91f6e..a5a1f580b39f609ec0c53c6ce69d3495924c9a35 100644
--- a/ui/aura/mus/window_tree_client.cc
+++ b/ui/aura/mus/window_tree_client.cc
@@ -1970,6 +1970,15 @@ void WindowTreeClient::OnWindowTreeHostCancelWindowMove(
       WindowMus::Get(window_tree_host->window())->server_id());
 }
 
+void WindowTreeClient::OnWindowTreeHostMoveCursorToScreenLocationInPixels(
+    const gfx::Point& location_in_pixels) {
+  DCHECK(window_manager_client_);
+  if (window_manager_client_) {
+    window_manager_client_->WmMoveCursorToScreenLocationInPixels(
+        location_in_pixels);
+  }
+}
+
 std::unique_ptr<WindowPortMus> WindowTreeClient::CreateWindowPortForTopLevel(
     const std::map<std::string, std::vector<uint8_t>>* properties) {
   std::unique_ptr<WindowPortMus> window_port =