Add Server-Timing support to devtools

third_party/WebKit/Source/devtools/front_end/sdk/ServerTiming.js

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @constructor
+ * @param {!WebInspector.Target} target
+ * @param {string} metric
+ * @param {number} value
+ * @param {string} description
+ */
+WebInspector.ServerTiming = function(target, metric, value, description)
+{
+    this._target = target;
+    this.metric = metric;
+    this.value = value;
+    this.description = description;
+}
+
+/**
+ * @param {!WebInspector.Target} target
+ * @param {!Array.<!WebInspector.NetworkRequest.NameValue>} headers
+ * @return {?Array.<!WebInspector.ServerTiming>}
+ */
+WebInspector.ServerTiming.parseHeaders = function(target, headers)
+{
+    var rawServerTimingHeaders = headers.filter(item => item.name.toLowerCase() === 'server-timing');
+    if (rawServerTimingHeaders.length === 0)
+        return null;
+    
+    function createFromHeaderValue(valueString)
+    {
+        if (!valueString)
+            return null;
+        var metricMatch = /\s*(\w+)\s*=\s*(\d+(?:\.\d+)?)\s*(?:;\s*(?:"(.*)"|(.*)))\s*/.exec(valueString);
+        if (!metricMatch)
+            return null;
+        return new WebInspector.ServerTiming(target, metricMatch[1], parseFloat(metricMatch[2]), metricMatch[3] || metricMatch[4]);
+    }
+    
+    var serverTimings = rawServerTimingHeaders.reduce((memo, header) => {
+        var timing = createFromHeaderValue(header.value);
+        if (timing)
+            memo.push(timing);
+        return memo;
+    }, []);
+    serverTimings.sort((a, b) => a.metric.toLowerCase().compareTo(b.metric.toLowerCase()));
+    return serverTimings;
+}