title: Create two child menus for every parent menu in chrome extension
body: <p>I've searched for this but no luck. I want to create two child menus for every parent menu in Google Chrome extension. But the code I have yet only creates child menus when the context is "page".
  Here's the code I'm currently trying:</p>
  
  <pre><code>var contexts = ["page","link","image"];
          for (var i = 0; i &lt; contexts.length; i++) {
        var context = contexts[i];
        var title = "";
  
        title = "Do something with this "+context;
        var id = chrome.contextMenus.create({"title": title, "contexts":[context]});
        var child1 = chrome.contextMenus.create({"title": "someThing1", "parentId": id, "onclick": onClickFunc});
        var child2 = chrome.contextMenus.create({"title": "someThing2", "parentId": id, "onclick": onClickFunc});
  }
  </code></pre>
  
  <p>Any idea??</p>