[MD Bookmarks] Convert bookmark list to iron-list.

chrome/test/data/webui/md_bookmarks/list_test.js

Index: chrome/test/data/webui/md_bookmarks/list_test.js
diff --git a/chrome/test/data/webui/md_bookmarks/list_test.js b/chrome/test/data/webui/md_bookmarks/list_test.js
index ff6b2a3cb77eb217376b105163333dd523b6e614..99be398de8e8175cb947bc2d8876ff43927c5434 100644
--- a/chrome/test/data/webui/md_bookmarks/list_test.js
+++ b/chrome/test/data/webui/md_bookmarks/list_test.js
@@ -21,6 +21,10 @@ suite('<bookmarks-list>', function() {
     bookmarks.Store.instance_ = store;
 
     list = document.createElement('bookmarks-list');
+    list.style.height = '100%';
+    list.style.width = '100%';
+    list.style.position= 'absolute';
+
     replaceBody(list);
     Polymer.dom.flush();
   });
@@ -55,4 +59,15 @@ suite('<bookmarks-list>', function() {
     customClick(list);
     assertEquals('deselect-items', store.lastAction.name);
   });
+
+  test('adds, deletes, and moves update displayedList_', function() {
+    list.displayedIds_ = ['1', '7', '3', '5'];
+    assertDeepEquals(list.displayedIds_, list.displayedList_.map(n => n.id));
+
+    list.displayedIds_ = ['1', '3', '5'];
+    assertDeepEquals(list.displayedIds_, list.displayedList_.map(n => n.id));
+
+    list.displayedIds_ = ['1', '3', '7', '5'];
+    assertDeepEquals(list.displayedIds_, list.displayedList_.map(n => n.id));
+  });
 });