[MD Bookmarks] Add a drag and drop indicator to bookmarks.

chrome/browser/resources/md_bookmarks/reducers.js

Index: chrome/browser/resources/md_bookmarks/reducers.js
diff --git a/chrome/browser/resources/md_bookmarks/reducers.js b/chrome/browser/resources/md_bookmarks/reducers.js
index db9be760dc3f49e1e70c3de0f2d3d15d46e264e4..2a61ecf8de9446689c272321d1d91ebd7d3c98f9 100644
--- a/chrome/browser/resources/md_bookmarks/reducers.js
+++ b/chrome/browser/resources/md_bookmarks/reducers.js
@@ -257,7 +257,7 @@ cr.define('bookmarks', function() {
       case 'clear-search':
         // TODO(tsergeant): Return to the folder that was selected before the
         // search.
-        return nodes['0'].children[0];
+        return nodes[bookmarks.util.ROOT_NODE_ID].children[0];
       default:
         return selectedFolder;
     }
@@ -276,9 +276,9 @@ cr.define('bookmarks', function() {
     var modifications = {};
     var currentId = id;
     while (currentId) {
-      if (closedFolders[currentId]) {
+      if (closedFolders[currentId])
         modifications[currentId] = false;
-      }
+
       currentId = nodes[currentId].parentId;
     }