DevTools: [SASS] implement CSS AST-builder.

third_party/WebKit/LayoutTests/inspector/sass/sass-test.js

 var initialize_SassTest = function() {
 
 InspectorTest.preloadModule("sass");
 
 InspectorTest.dumpAST = function(ast)
 {
     var lines = [String.sprintf("=== AST === %s", ast.document.url)];
     for (var i = 0; i < ast.rules.length; ++i) {
         var rule = ast.rules[i];
         lines.push(String.sprintf("rule %d: \"%s\"", i, rule.selector));
@@ skipping 68 matching lines @@
 {
     return self.runtime.instancePromise(WebInspector.TokenizerFactory)
         .then(onTokenizer);
 
     function onTokenizer(tokenizer)
     {
         return WebInspector.SASSSupport.parseSCSS(url, text, tokenizer);
     }
 }
 
+var cssParser = null;
+
+InspectorTest.parseCSS = function(url, text)
+{
+    if (!cssParser)
+        cssParser = new WebInspector.CSSParser();
+    return WebInspector.SASSSupport.parseCSS(cssParser, url, text);
+}
+
 }