DevTools: patch browser's Chrome version into Chrome user agents for emulation

third_party/WebKit/Source/devtools/front_end/common/BrowserVersionInfo.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.
+
+WebInspector.BrowserVersionInfo = {
+    /**
+     * @param {string} uaString
+     * @return {string}
+     */
+    patchUserAgentWithChromeVersion: function(uaString)
+    {
+        // Patches Chrome/CriOS version from user agent ("1.2.3.4" when user agent is: "Chrome/1.2.3.4").
+        var chromeRegex = new RegExp("((?:^|\\W)Chrome/)(\\S+)");
+        var criosRegex = new RegExp("((?:^|\\W)CriOS/)(\\S+)");
+        var chromeMatch = navigator.userAgent.match(chromeRegex);
+        if (chromeMatch && chromeMatch.length > 2)
+            return uaString.replace(chromeRegex, "$1" + chromeMatch[2]).replace(criosRegex, "$1" + chromeMatch[2]);
+        return uaString;
+    }
+};