Implement large cursors in Mushrome.

ui/aura/test/mus/test_window_manager_client.cc

Index: ui/aura/test/mus/test_window_manager_client.cc
diff --git a/ui/aura/test/mus/test_window_manager_client.cc b/ui/aura/test/mus/test_window_manager_client.cc
index 8ecb9dea8193024e868ce3eef9de2641cfcbdfc3..9e500d73ae22fe980f5a42fcf407f0c1409a82e4 100644
--- a/ui/aura/test/mus/test_window_manager_client.cc
+++ b/ui/aura/test/mus/test_window_manager_client.cc
@@ -69,6 +69,8 @@ void TestWindowManagerClient::WmUnlockCursor() {}
 
 void TestWindowManagerClient::WmSetCursorVisible(bool visible) {}
 
+void TestWindowManagerClient::WmSetCursorSize(ui::CursorSize cursor_size) {}
+
 void TestWindowManagerClient::WmSetGlobalOverrideCursor(
     base::Optional<ui::CursorData> cursor) {}