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

chrome/browser/resources/md_bookmarks/app.js

 // Copyright 2016 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.
 
 Polymer({
   is: 'bookmarks-app',
 
   behaviors: [
     bookmarks.StoreClient,
   ],
 
   properties: {
     /** @private */
     searchTerm_: {
       type: String,
       observer: 'searchTermChanged_',
     },
 
     /** @private */
     sidebarWidth_: String,
   },
 
   /** @private{?function(!Event)} */
   boundUpdateSidebarWidth_: null,
 
+  /** @private {bookmarks.DNDManager} */
+  dnd_manager_: null,

[tsergeant, 2017/03/23 00:28:23]

camelCase for member names

[calamity, 2017/03/23 06:12:33]

Done.

+
   /** @override */
   attached: function() {
     this.watch('searchTerm_', function(store) {
       return store.search.term;
     });
 
     chrome.bookmarks.getTree(function(results) {
       var nodeList = bookmarks.util.normalizeNodes(results[0]);
       var initialState = bookmarks.util.createEmptyState();
       initialState.nodes = nodeList;
-      initialState.selectedFolder = nodeList['0'].children[0];
+      initialState.selectedFolder =
+          nodeList[bookmarks.util.ROOT_NODE_ID].children[0];
 
       bookmarks.Store.getInstance().init(initialState);
       bookmarks.ApiListener.init();
 
     }.bind(this));
 
     this.boundUpdateSidebarWidth_ = this.updateSidebarWidth_.bind(this);
 
     this.initializeSplitter_();
+
+    this.dnd_manager_ = new bookmarks.DNDManager();
+    this.dnd_manager_.init();
   },
 
   detached: function() {
     window.removeEventListener('resize', this.boundUpdateSidebarWidth_);
+    this.dnd_manager_.destroy();
   },
 
   /**
    * Set up the splitter and set the initial width from localStorage.
    * @private
    */
   initializeSplitter_: function() {
     var splitter = this.$.splitter;
     cr.ui.Splitter.decorate(splitter);
     var splitterTarget = this.$.sidebar;
@@ skipping 24 matching lines @@
       return;
 
     chrome.bookmarks.search(this.searchTerm_, function(results) {
       var ids = results.map(function(node) {
         return node.id;
       });
       this.dispatch(bookmarks.actions.setSearchResults(ids));
     }.bind(this));
   },
 });