DevTools: add entry points for command menu

third_party/WebKit/Source/devtools/front_end/sources/TabbedEditorContainer.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:
  *
  * 1. Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *
@@ skipping 27 matching lines @@
   viewForFile(uiSourceCode) {},
 };
 
 /**
  * @unrestricted
  */
 Sources.TabbedEditorContainer = class extends Common.Object {
   /**
    * @param {!Sources.TabbedEditorContainerDelegate} delegate
    * @param {!Common.Setting} setting
-   * @param {string} placeholderText
+   * @param {!Element} placeholderElement
    */
-  constructor(delegate, setting, placeholderText) {
+  constructor(delegate, setting, placeholderElement) {
     super();
     this._delegate = delegate;
 
     this._tabbedPane = new UI.TabbedPane();
-    this._tabbedPane.setPlaceholderText(placeholderText);
+    this._tabbedPane.setPlaceholderElement(placeholderElement);
     this._tabbedPane.setTabDelegate(new Sources.EditorContainerTabDelegate(this));
 
     this._tabbedPane.setCloseableTabs(true);
     this._tabbedPane.setAllowTabReorder(true, true);
 
     this._tabbedPane.addEventListener(UI.TabbedPane.Events.TabClosed, this._tabClosed, this);
     this._tabbedPane.addEventListener(UI.TabbedPane.Events.TabSelected, this._tabSelected, this);
 
     Persistence.persistence.addEventListener(
         Persistence.Persistence.Events.BindingCreated, this._onBindingCreated, this);
@@ skipping 741 matching lines @@
 
   /**
    * @override
    * @param {string} tabId
    * @param {!UI.ContextMenu} contextMenu
    */
   onContextMenu(tabId, contextMenu) {
     this._editorContainer._onContextMenu(tabId, contextMenu);
   }
 };