[MD Bookmarks] Add a drag and drop indicator to bookmarks.

chrome/browser/resources/md_bookmarks/util.js

 // Copyright 2017 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.
 
 /**
  * @fileoverview Utility functions for the Bookmarks page.
  */
 
 cr.define('bookmarks.util', function() {
   /**
    * @param {!BookmarksPageState} state
    * @return {!Array<string>}
    */
   function getDisplayedList(state) {
     if (state.selectedFolder)

[tsergeant, 2017/03/20 03:01:50]

Call isShowingSearch from here, so we don't duplicate this logic

[calamity, 2017/03/22 05:29:52]

Done.

       return assert(state.nodes[state.selectedFolder].children);
 
     return state.search.results;
   }
 
   /**
    * @param {BookmarkTreeNode} rootNode
    * @return {NodeList}
    */
   function normalizeNodes(rootNode) {
@@ skipping 34 matching lines @@
         inProgress: false,
         results: [],
       },
       selection: {
         items: {},
         anchor: null,
       },
     };
   }
 
+  function isShowingSearch(state) {

[tsergeant, 2017/03/20 03:01:50]

Annotate this function

[calamity, 2017/03/22 05:29:52]

Done.

+    return !state.selectedFolder;
+  }
+
   return {
     createEmptyState: createEmptyState,
     getDisplayedList: getDisplayedList,
+    isShowingSearch: isShowingSearch,
     normalizeNodes: normalizeNodes,
   };
 });