Implement large cursors in Mushrome.

services/ui/ws/window_tree.cc

Index: services/ui/ws/window_tree.cc
diff --git a/services/ui/ws/window_tree.cc b/services/ui/ws/window_tree.cc
index ee3cbc149637ace04585064e844d33f06ff1886e..e57adb8fe5d2fe90b157a7b1e588cdd27fad6fd6 100644
--- a/services/ui/ws/window_tree.cc
+++ b/services/ui/ws/window_tree.cc
@@ -2356,6 +2356,11 @@ void WindowTree::WmSetCursorVisible(bool visible) {
   window_manager_state_->cursor_state().SetCursorVisible(visible);
 }
 
+void WindowTree::WmSetCursorSize(ui::CursorSize cursor_size) {
+  DCHECK(window_manager_state_);
+  window_manager_state_->cursor_state().SetCursorSize(cursor_size);
+}
+
 void WindowTree::WmSetGlobalOverrideCursor(
     base::Optional<ui::CursorData> cursor) {
   DCHECK(window_manager_state_);