DevTools: edit SASS through SourceMaps.

Source/devtools/front_end/workspace/UISourceCode.js

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 226 matching lines @@
         if (this._content || this._contentLoaded) {
             callback(this._content);
             return;
         }
         this._requestContentCallbacks.push(callback);
         if (this._requestContentCallbacks.length === 1)
             this._project.requestFileContent(this, this._fireContentAvailable.bind(this));
     },
 
     /**
+     * @return {!Promise.<?string>}
+     */
+    requestContentPromise: function()
+    {
+        return new Promise(promiseConstructor.bind(this));
+
+        function promiseConstructor(succ, fail)
+        {
+            this.requestContent(succ);
+        }
+    },
+
+    /**
      * @param {function()} callback
      */
     _pushCheckContentUpdatedCallback: function(callback)
     {
         if (!this._checkContentUpdatedCallbacks)
             this._checkContentUpdatedCallbacks = [];
         this._checkContentUpdatedCallbacks.push(callback);
     },
 
     _terminateContentCheck: function()
@@ skipping 462 matching lines @@
      * @param {string} query
      * @param {boolean} caseSensitive
      * @param {boolean} isRegex
      * @param {function(!Array.<!WebInspector.ContentProvider.SearchMatch>)} callback
      */
     searchInContent: function(query, caseSensitive, isRegex, callback)
     {
         callback([]);
     }
 }