Make the Bookmark Manager aware of managed bookmarks.

chrome/browser/resources/bookmark_manager/js/bmm.js

Index: chrome/browser/resources/bookmark_manager/js/bmm.js
diff --git a/chrome/browser/resources/bookmark_manager/js/bmm.js b/chrome/browser/resources/bookmark_manager/js/bmm.js
index 0d7c491f5df305db848fdb25a9f4cedabfad0c07..62a49463fd6766efc483ecfda21356f63852b6ae 100644
--- a/chrome/browser/resources/bookmark_manager/js/bmm.js
+++ b/chrome/browser/resources/bookmark_manager/js/bmm.js
@@ -4,6 +4,13 @@
 
 cr.define('bmm', function() {
   /**
+   * The id of the managed node.
+   * @type {string}
+   * @const
+   */
+  var MANAGED_NODE_ID = '4';
+
+  /**
    * Whether a node contains another node.
    * TODO(yosin): Once JavaScript style guide is updated and linter follows
    * that, we'll remove useless documentations for |parent| and |descendant|.
@@ -30,6 +37,21 @@ cr.define('bmm', function() {
     return !('url' in node);
   }
 
+  /**
+   * @param {BookmarkTreeNode} node The node to test.
+   * @return {boolean} Whether the node is managed.
+   */
+  function isManaged(node) {
+    if (!node)
+      return false;
+    if (node.id === MANAGED_NODE_ID)
+      return true;
+    // The managed node may be invisible, in which case it won't exist in
+    // |bmm.treeLookup|.
+    var managedNode = bmm.treeLookup[MANAGED_NODE_ID];
+    return managedNode && bmm.contains(managedNode.bookmarkNode, node);
+  }
+
   var loadingPromises = {};
 
   /**
@@ -242,6 +264,7 @@ cr.define('bmm', function() {
   return {
     contains: contains,
     isFolder: isFolder,
+    isManaged: isManaged,
     loadSubtree: loadSubtree,
     loadTree: loadTree,
     addBookmarkModelListeners: addBookmarkModelListeners