Obey --mobile for WPR (#2654)

bin/browsertimeWebPageReplay.js

@@ -6,8 +6,13 @@ const yargs = require('yargs');
 const browsertime = require('browsertime');
 const merge = require('lodash.merge');
 const getURLs = require('../lib/cli/util').getURLs;
+const get = require('lodash.get');
 const browsertimeConfig = require('../lib/plugins/browsertime/index').config;
 
+const iphone6UserAgent =
+  'Mozilla/5.0 (iPhone; CPU iPhone OS 6_1_3 like Mac OS X) AppleWebKit/536.26 ' +
+  '(KHTML, like Gecko) Version/6.0 Mobile/10B329 Safari/8536.25';
+
 async function testURLs(engine, urls) {
   try {
     await engine.start();
@@ -35,6 +40,17 @@ async function runBrowsertime() {
       choices: ['chrome', 'firefox'],
       group: 'Browser'
     })
+    .option('mobile', {
+      describe:
+        'Access pages as mobile a fake mobile device. Set UA and width/height. For Chrome it will use device Apple iPhone 6.',
+      default: false,
+      type: 'boolean'
+    })
+    .option('browsertime.chrome.mobileEmulation.deviceName', {
+      describe:
+        "Name of device to emulate. Works only standalone (see list in Chrome DevTools, but add phone like 'iPhone 6'). This will override your userAgent string.",
+      group: 'chrome'
+    })
     .option('browsertime.viewPort', {
       default: browsertimeConfig.viewPort,
       describe: 'The browser view port size WidthxHeight like 400x300',
@@ -60,6 +76,22 @@ async function runBrowsertime() {
   const btOptions = merge({}, parsed.argv.browsertime, defaultConfig);
   browsertime.logging.configure(parsed.argv);
 
+  if (btOptions.mobile) {
+    btOptions.viewPort = '360x640';
+    if (btOptions.browser === 'chrome') {
+      const emulation = get(
+        btOptions,
+        'chrome.mobileEmulation.deviceName',
+        'iPhone 6'
+      );
+      btOptions.chrome.mobileEmulation = {
+        deviceName: emulation
+      };
+    } else {
+      btOptions.userAgent = iphone6UserAgent;
+    }
+  }
+
   const engine = new browsertime.Engine(btOptions);
   const urls = getURLs(parsed.argv._);