[MD Extensions] Implement opening tab-style options pages

chrome/browser/resources/md_extensions/item.js

Index: chrome/browser/resources/md_extensions/item.js
diff --git a/chrome/browser/resources/md_extensions/item.js b/chrome/browser/resources/md_extensions/item.js
index 144fe3bb11677b67e555f8fa4bd6b7747b2ea0dc..70929a12ecaa1ebe2be6c8923d41adacdeefdb8b 100644
--- a/chrome/browser/resources/md_extensions/item.js
+++ b/chrome/browser/resources/md_extensions/item.js
@@ -41,13 +41,16 @@ cr.define('extensions', function() {
     setItemCollectsErrors: assertNotReached,
 
     /**
-     * @param {string} id,
+     * @param {string} id
      * @param {chrome.developerPrivate.ExtensionView} view
      */
     inspectItemView: assertNotReached,
 
     /** @param {string} id */
     repairItem: assertNotReached,
+
+    /** @param {string} id */
+    showItemOptionsPage: assertNotReached,
   };
 
   var Item = Polymer({