DevTools: introduce API for the Common.FormatterWorkerPool.

third_party/WebKit/Source/devtools/front_end/sass/SASSSupport.js

Index: third_party/WebKit/Source/devtools/front_end/sass/SASSSupport.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sass/SASSSupport.js b/third_party/WebKit/Source/devtools/front_end/sass/SASSSupport.js
index 7a1cbb5c9a8a4104590e4e1140b5222f9a5002a5..95f8782b4a73299bd015a567e156b4053693e0af 100644
--- a/third_party/WebKit/Source/devtools/front_end/sass/SASSSupport.js
+++ b/third_party/WebKit/Source/devtools/front_end/sass/SASSSupport.js
@@ -12,16 +12,13 @@ Sass.SASSSupport.parseSCSS = function(url, content) {
   var text = new Common.Text(content);
   var document = new Sass.SASSSupport.ASTDocument(url, text);
 
-  return Common.formatterWorkerPool.runTask('parseSCSS', {content: content}).then(onParsed);
+  return Common.formatterWorkerPool.parseSCSS(content).then(onParsed);
 
   /**
-   * @param {?MessageEvent} event
+   * @param {!Array<!Object>} data
    * @return {!Sass.SASSSupport.AST}
    */
-  function onParsed(event) {
-    if (!event)
-      return new Sass.SASSSupport.AST(document, []);
-    var data = /** @type {!Array<!Object>} */ (event.data);
+  function onParsed(data) {
     var rules = [];
     for (var i = 0; i < data.length; ++i) {
       var rulePayload = data[i];