Devtools: [WIP] Implement enhanced devtools extension language APIs

Source/devtools/front_end/source_frame/ResourceSourceFrame.js

 /*
  * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) IBM Corp. 2009  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 46 matching lines @@
     {
         for (var message of this._messages)
             this.addMessageToSource(WebInspector.SourceFrameMessage.fromConsoleMessage(message, message.line - 1, message.column));
     },
 
     get resource()
     {
         return this._resource;
     },
 
+    /**
+     * @override
+     * @param {!WebInspector.ContextMenu} contextMenu
+     * @param {number} lineNumber
+     * @param {number} columnNumber
+     * @return {!Promise}
+     */
     populateTextAreaContextMenu: function(contextMenu, lineNumber, columnNumber)
     {
         contextMenu.appendApplicableItems(this._resource);
+        return Promise.resolve();
     },
 
     __proto__: WebInspector.SourceFrame.prototype
 }
 
 /**
  * @constructor
  * @extends {WebInspector.VBox}
  * @param {!WebInspector.ContentProvider} resource
  */
@@ skipping 17 matching lines @@
     /**
      * @param {?string} content
      */
     _contentLoaded: function(content)
     {
         this._content.textContent = content;
     },
 
     __proto__: WebInspector.VBox.prototype
 }