Add {Lock,Unlock,Show,Hide}Cursor() to the window manager mojom.

services/ui/ws/window_server.cc

Index: services/ui/ws/window_server.cc
diff --git a/services/ui/ws/window_server.cc b/services/ui/ws/window_server.cc
index 3a46d4db3178b08b44c7b33ad70d372c6f0da0c3..fa3ade442d8d11a04c3407d42800467d6605e607 100644
--- a/services/ui/ws/window_server.cc
+++ b/services/ui/ws/window_server.cc
@@ -599,7 +599,7 @@ void WindowServer::UpdateNativeCursorFromMouseLocation(ServerWindow* window) {
     EventDispatcher* event_dispatcher =
         display_root->window_manager_state()->event_dispatcher();
     event_dispatcher->UpdateCursorProviderByLastKnownLocation();
-    display_root->display()->UpdateNativeCursor(
+    display_root->window_manager_state()->cursor_state().SetCurrentWindowCursor(
         event_dispatcher->GetCurrentMouseCursor());
   }
 }
@@ -616,7 +616,7 @@ void WindowServer::UpdateNativeCursorIfOver(ServerWindow* window) {
     return;
 
   event_dispatcher->UpdateNonClientAreaForCurrentWindow();
-  display_root->display()->UpdateNativeCursor(
+  display_root->window_manager_state()->cursor_state().SetCurrentWindowCursor(
       event_dispatcher->GetCurrentMouseCursor());
 }