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

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 c0be4847f2849e7449f9dea0103cdba3555ad008..dbfcb47b4f271e3ce402ed498d9ab7eb06374514 100644
--- a/chrome/browser/resources/md_bookmarks/item.js
+++ b/chrome/browser/resources/md_bookmarks/item.js
@@ -15,6 +15,8 @@ Polymer({
       observer: 'onItemIdChanged_',
     },
 
+    ironListTabIndex: String,
+
     /** @private {BookmarkNode} */
     item_: {
       type: Object,
@@ -28,6 +30,12 @@ Polymer({
     },
 
     /** @private */
+    mouseFocus_: {
+      type: Boolean,
+      reflectToAttribute: true,
+    },
+
+    /** @private */
     isFolder_: Boolean,
   },
 
@@ -36,6 +44,8 @@ Polymer({
   ],
 
   listeners: {
+    'mousedown': 'onMousedown_',
+    'blur': 'onItemBlur_',
     'click': 'onClick_',
     'dblclick': 'onDblClick_',
     'contextmenu': 'onContextMenu_',
@@ -109,6 +119,20 @@ Polymer({
   },
 
   /**
+   * @private
+   */
+  onMousedown_: function() {
+    this.mouseFocus_ = true;
+  },
+
+  /**
+   * @private
+   */
+  onItemBlur_: function() {
+    this.mouseFocus_ = false;
+  },
+
+  /**
    * @param {Event} e
    * @private
    */