DevTools: [SASS] implement CSS AST-builder.

third_party/WebKit/Source/devtools/front_end/sdk/CSSParser.js

Index: third_party/WebKit/Source/devtools/front_end/sdk/CSSParser.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sdk/CSSParser.js b/third_party/WebKit/Source/devtools/front_end/sdk/CSSParser.js
index a09318cafda6f621ba9356ede237108745c1287d..e19aefb2105fd9ed8eaf534ddb45c86977d11d2e 100644
--- a/third_party/WebKit/Source/devtools/front_end/sdk/CSSParser.js
+++ b/third_party/WebKit/Source/devtools/front_end/sdk/CSSParser.js
@@ -42,6 +42,25 @@ WebInspector.CSSParser.prototype = {
         this._innerParse(text);
     },
 
+    /**
+     * @param {string} text
+     * @return {!Promise<!Array.<!WebInspector.CSSParser.Rule>>}
+     */
+    parsePromise: function(text)
+    {
+        return new Promise(promiseConstructor.bind(this));
+
+        /**
+         * @param {function()} succ
+         * @param {function()} fail
+         * @this {WebInspector.CSSParser}
+         */
+        function promiseConstructor(succ, fail)
+        {
+            this.parse(text, succ);
+        }
+    },
+
     dispose: function()
     {
         if (this._worker) {