protected void runPassesOnNewTree(CssTree cssTree, ErrorManager errorManager) {
MutatingVisitController mutatingVisitController = cssTree.getMutatingVisitController();
new CreateConditionalNodes(mutatingVisitController, errorManager).runPass();
new CreateRuntimeConditionalNodes(mutatingVisitController).runPass();
new CreateStandardAtRuleNodes(mutatingVisitController, errorManager).runPass();
ResourceContext context = mockResourceContext();
Map<String, GssFunction> gssFunctionMap = new GwtGssFunctionMapProvider(context).get();
new ResolveCustomFunctionNodes(mutatingVisitController, errorManager,
gssFunctionMap, true, new HashSet<String>()).runPass();