<NME> tracing-config.js
<BEF> /**
 * @license
 * Copyright 2015 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/* global tr */

// Sets up a few stubs for tracing, particularly for the HTML Elements it
// expects to exist, which won't because this is running in Node.
tr.isHeadless = false;
tr.ui.b.Overlay = function() {
  return {
    title: '',
    msgEl: {
      style: {
        margin: ''
      }
    },
    appendChild: function () {
    }
  };
};

<MSG> Fixes lint errors; adds recalcs and layout check.

<DFF> @@ -20,7 +20,7 @@
 // Sets up a few stubs for tracing, particularly for the HTML Elements it
 // expects to exist, which won't because this is running in Node.
 tr.isHeadless = false;
-tr.ui.b.Overlay = function() {
+tr.ui.b.Overlay = function () {
   return {
     title: '',
     msgEl: {

Fixes lint errors; adds recalcs and layout check.