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

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

Index: chrome/test/data/webui/md_bookmarks/reducers_test.js
diff --git a/chrome/test/data/webui/md_bookmarks/reducers_test.js b/chrome/test/data/webui/md_bookmarks/reducers_test.js
index f95592375c33f128b35cb2d9fc5a87b479f91281..a23c27ec08ea15f8ca3b27182a9b6b40876fe77b 100644
--- a/chrome/test/data/webui/md_bookmarks/reducers_test.js
+++ b/chrome/test/data/webui/md_bookmarks/reducers_test.js
@@ -98,6 +98,13 @@ suite('selection state', function() {
     assertDeepEquals(['2', '3'], normalizeSet(selection.items));
   });
 
+  test('update anchor', function() {
+    action = bookmarks.actions.updateAnchor('3');
+    selection = bookmarks.SelectionState.updateSelection(selection, action);
+
+    assertEquals('3', selection.anchor);
+  });
+
   test('deselects items when they are deleted', function() {
     var nodeMap = testTree(createFolder('0', [
       createFolder(