MD Bookmarks: Add basic page features to new data-flow system

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 837841e299809e80939d84538e32b7b5f400dd2e..b024e2662cc438fcb33f6de44b8ff4fe5127003f 100644
--- a/chrome/test/data/webui/md_bookmarks/test_util.js
+++ b/chrome/test/data/webui/md_bookmarks/test_util.js
@@ -12,6 +12,13 @@ function replaceBody(element) {
 }
 
 /**
+ * Convert a tree of bookmark nodes into a normalized lookup table of nodes.
+ */
+function testTree(root) {
+  return bookmarks.util.normalizeNodes(root);
+}
+
+/**
  * Initialize a tree for UI testing. This performs the same initialization as
  * `setUpStore_` in <bookmarks-store>, but without the need for a store element
  * in the test.