Implement a MoveCursorToScreenLocation for just the window manager.

ui/aura/mus/window_tree_host_mus_delegate.h

Index: ui/aura/mus/window_tree_host_mus_delegate.h
diff --git a/ui/aura/mus/window_tree_host_mus_delegate.h b/ui/aura/mus/window_tree_host_mus_delegate.h
index b93c65980951e2b6b3572456c1db2067ab81d747..f82a782912e7ef4e9276d2b95eb3e5eabdb90468 100644
--- a/ui/aura/mus/window_tree_host_mus_delegate.h
+++ b/ui/aura/mus/window_tree_host_mus_delegate.h
@@ -71,6 +71,10 @@ class AURA_EXPORT WindowTreeHostMusDelegate {
   virtual void OnWindowTreeHostCancelWindowMove(
       WindowTreeHostMus* window_tree_host) = 0;
 
+  // Called to move the location of the cursor.
+  virtual void OnWindowTreeHostMoveCursorToScreenLocationInPixels(
+      const gfx::Point& location_in_pixels) = 0;
+
   // Called when a WindowTreeHostMus is created without a WindowPort.
   // TODO: this should take an unordered_map, see http://crbug.com/670515.
   virtual std::unique_ptr<WindowPortMus> CreateWindowPortForTopLevel(