[MD Bookmarks] Add lines between items and no search results message.

chrome/browser/resources/md_bookmarks/item.js

Index: chrome/browser/resources/md_bookmarks/item.js
diff --git a/chrome/browser/resources/md_bookmarks/item.js b/chrome/browser/resources/md_bookmarks/item.js
index 13e698245beb96e9f96eee2344a157b7aadb109e..c4985d58aac38b736bb37b2c5c88a348df76e5e4 100644
--- a/chrome/browser/resources/md_bookmarks/item.js
+++ b/chrome/browser/resources/md_bookmarks/item.js
@@ -13,6 +13,12 @@ Polymer({
     },
 
     isFolder_: Boolean,
+
+    isLastItem: {
+      type: Boolean,
+      value: false,
+      reflectToAttribute: true,
+    },
   },
 
   observers: [
@@ -26,7 +32,7 @@ Polymer({
   onMenuButtonOpenTap_: function(e) {
     this.fire('open-item-menu', {
       target: e.target,
-      item: this.item
+      item: this.item,
     });
   },