[MD Bookmarks] Add keyboard navigation and selection to bookmark list.

chrome/browser/resources/md_bookmarks/item.html

Index: chrome/browser/resources/md_bookmarks/item.html
diff --git a/chrome/browser/resources/md_bookmarks/item.html b/chrome/browser/resources/md_bookmarks/item.html
index 5b8bc2e012cf6035a0ade3a967159783b6846caf..6a26dbb344f200c45886b3e6f147630916a37ffc 100644
--- a/chrome/browser/resources/md_bookmarks/item.html
+++ b/chrome/browser/resources/md_bookmarks/item.html
@@ -61,8 +61,12 @@
       button.more-vert-button {
         -webkit-margin-end: 12px;
       }
+
+      a {
+        outline: none;
+      }
     </style>
-    <a id="url" href="[[openItemUrl_]]">
+    <a id="url" href="[[openItemUrl_]]" tabindex="-1">

[tsergeant, 2017/05/23 07:25:17]

As discussed, maybe change this <a> back into a <div> in this CL (😢), and then
we can follow up to re-enable middle click later.

[calamity, 2017/05/25 07:36:29]

Acknowledged.

       <div id="icon-wrapper">
         <iron-icon id="folder-icon" icon="cr:folder" hidden$="[[!isFolder_]]">
         </iron-icon>