Roll Lighthouse & add error reporting

third_party/WebKit/Source/devtools/front_end/audits2/lighthouse/renderer/util.js

Index: third_party/WebKit/Source/devtools/front_end/audits2/lighthouse/renderer/util.js
diff --git a/third_party/WebKit/Source/devtools/front_end/audits2/lighthouse/renderer/util.js b/third_party/WebKit/Source/devtools/front_end/audits2/lighthouse/renderer/util.js
new file mode 100644
index 0000000000000000000000000000000000000000..d92c65c83161c54efd429a091e56a1804a045dd4
--- /dev/null
+++ b/third_party/WebKit/Source/devtools/front_end/audits2/lighthouse/renderer/util.js
@@ -0,0 +1,78 @@
+/**
+ * Copyright 2017 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.
+ */
+'use strict';
+
+/* globals self */
+
+const RATINGS = {
+  PASS: {label: 'pass', minScore: 75},
+  AVERAGE: {label: 'average', minScore: 45},
+  FAIL: {label: 'fail'}
+};
+
+class Util {
+  /**
+   * Convert a score to a rating label.
+   * @param {number} score
+   * @return {string}
+   */
+  static calculateRating(score) {
+    let rating = RATINGS.FAIL.label;
+    if (score >= RATINGS.PASS.minScore) {
+      rating = RATINGS.PASS.label;
+    } else if (score >= RATINGS.AVERAGE.minScore) {
+      rating = RATINGS.AVERAGE.label;
+    }
+    return rating;
+  }
+
+  /**
+   * Format number.
+   * @param {number} number
+   * @return {string}
+   */
+  static formatNumber(number) {
+    return number.toLocaleString(undefined, {maximumFractionDigits: 1});
+  }
+
+  /**
+   * Format time.
+   * @param {string} date
+   * @return {string}
+   */
+  static formatDateTime(date) {
+    const options = {
+      month: 'short', day: 'numeric', year: 'numeric',
+      hour: 'numeric', minute: 'numeric', timeZoneName: 'short'
+    };
+    let formatter = new Intl.DateTimeFormat('en-US', options);
+
+    // Force UTC if runtime timezone could not be detected.
+    // See https://github.com/GoogleChrome/lighthouse/issues/1056
+    const tz = formatter.resolvedOptions().timeZone;
+    if (!tz || tz.toLowerCase() === 'etc/unknown') {
+      options.timeZone = 'UTC';
+      formatter = new Intl.DateTimeFormat('en-US', options);
+    }
+    return formatter.format(new Date(date));
+  }
+}
+
+if (typeof module !== 'undefined' && module.exports) {
+  module.exports = Util;
+} else {
+  self.Util = Util;
+}