[MD Bookmarks] Add Select for Bookmarks.

chrome/browser/resources/md_bookmarks/folder_node.js

Index: chrome/browser/resources/md_bookmarks/folder_node.js
diff --git a/chrome/browser/resources/md_bookmarks/folder_node.js b/chrome/browser/resources/md_bookmarks/folder_node.js
index d58b28c2246418c6019b3f6fa11fc1e3b907eca4..2212a6c680f050e9fd166d734630768150438247 100644
--- a/chrome/browser/resources/md_bookmarks/folder_node.js
+++ b/chrome/browser/resources/md_bookmarks/folder_node.js
@@ -9,7 +9,7 @@ Polymer({
     /** @type {BookmarkTreeNode} */
     item: Object,
 
-    isSelected: {
+    isSelectedFolder: {
       type: Boolean,
       value: false,
       reflectToAttribute: true,
@@ -21,7 +21,7 @@ Polymer({
    * @return {string}
    */
   getFolderIcon_: function() {
-    return this.isSelected ? 'bookmarks:folder-open' : 'cr:folder';
+    return this.isSelectedFolder ? 'bookmarks:folder-open' : 'cr:folder';
   },
 
   /**
@@ -54,6 +54,9 @@ Polymer({
    * @return {boolean}
    */
   hasChildFolder_: function() {
+    if (!this.item.children)
+      return false;
+

[jiaxi, 2017/01/20 04:51:09]

This helps when a folder has been removed but the parent still thinks there's a
folder.

[calamity, 2017/01/23 00:44:27]

Does this get recalculated properly? You may need to set the computed binding to
depend on item.children.splices or item.children.length for this to recalculate
at delete time.

[jiaxi, 2017/01/23 06:14:46]

Done.

     for (var i = 0; i < this.item.children.length; i++) {
       if (!this.item.children[i].url)
         return true;