[MD Bookmarks] Add UI for Material Bookmarks.

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

Index: chrome/test/data/webui/md_bookmarks/test_util.js
diff --git a/chrome/test/data/webui/md_bookmarks/test_util.js b/chrome/test/data/webui/md_bookmarks/test_util.js
index 84c1a6bb185c370fa4494ea8f59f2e62df472543..d5e5c473257f91748344ed782abb665379c6a01f 100644
--- a/chrome/test/data/webui/md_bookmarks/test_util.js
+++ b/chrome/test/data/webui/md_bookmarks/test_util.js
@@ -3,10 +3,13 @@
 // found in the LICENSE file.
 
 /**
- * Replace the current body of the test with a new element.
+ * Replace the current primary element of the test with a new element. Useful

[tsergeant, 2017/01/03 23:31:17]

As above, undo all changes to this file.

[jiaxi, 2017/01/04 02:50:16]

Done.

+ * as an alternative to PolymerTest.clearBody() which preserves styling.
  * @param {Element} element
  */
 function replaceBody(element) {
-  PolymerTest.clearBody();
-  document.body.appendChild(element);
+  var body = document.body;
+  while (body.children.length > 0)
+    body.removeChild(body.children[0]);
+  body.appendChild(element);
 }