replaceConstantReferences.runPass();
new ImageSpriteCreator(cssTree.getMutatingVisitController(), context, errorManager).runPass();
Map<String, GssFunction> gssFunctionMap = new GwtGssFunctionMapProvider(context).get();
new ResolveCustomFunctionNodes(cssTree.getMutatingVisitController(), errorManager,
gssFunctionMap, true, allowedNonStandardFunctions).runPass();
if (simplifyCss) {
// Eliminate empty rules.
new EliminateEmptyRulesetNodes(cssTree.getMutatingVisitController()).runPass();