Open search result of drive search in Chrome Launcher.

ui/file_manager/externs/launcher_search_provider.js

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * Namespace for chrome.launcherSearchProvider API. Since this API is under
  * development and idl change may happen, we put extern file under
  * ui/file_manager as temporary.
  */
 chrome.launcherSearchProvider = {};
 
 /**
  * @param {string} queryId
  * @param {Array<{itemId:string, title:string, iconUrl:?string,
  *     relevance:number}>} results
  */
 chrome.launcherSearchProvider.setSearchResults = function(queryId, results) {};
 
 /**
  * @type {!ChromeEvent}
  */
 chrome.launcherSearchProvider.onQueryStarted;
 
 /**
  * @type {!ChromeEvent}
  */
 chrome.launcherSearchProvider.onQueryEnded;
+
+/**
+ * @type {!ChromeEvent}
+ */
+chrome.launcherSearchProvider.onOpenResult;