Add Web Page Replay test to page cycler.

tools/page_cycler/webpagereplay/extension/start.js

+// Copyright (c) 2012 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.
+
+document.cookie = "__navigated_to_report=0; path=/";
+document.cookie = "__pc_done=0; path=/";
+document.cookie = "__pc_timings=; path=/";
+
+function dirname(path) {
+  var match = path.match(/(.*)\//);
+  if (match) {
+    return match[1];
+  } else {
+    return ".";
+  }
+}
+
+function IsWprRecordMode() {
+  var kStatusUrl = "http://wprwprwpr/web-page-replay-command-status";
+  var isRecordMode;
+  var xhr = new XMLHttpRequest();
+  var useAsync = false;
+  xhr.open("GET", kStatusUrl, useAsync);
+  xhr.timeout = 500;
+  xhr.onreadystatechange = function() {
+    if (xhr.readyState == 4 && xhr.status == 200) {
+      var status = JSON.parse(xhr.responseText);
+      isRecordMode = status["is_record_mode"];
+      console.log("WPR record mode?: " + isRecordMode);
+    }
+  };
+  try {
+    xhr.send();
+  } catch(e) {
+    throw "Web Page Replay is not responding. Start WPR to continue."
+  }
+  return isRecordMode;
+}
+
+
+function TryStart() {
+  console.log("try start");
+  var status_element = document.getElementById("status");
+
+  var config_json;
+  var config;
+  try {
+    config_json = document.getElementById("json").textContent;
+    config = JSON.parse(config_json);
+  } catch(err) {
+    console.log("Bad json data: " + config_json);
+    status_element.textContent = "Exception: " + err + "\njson data: " +
+        config_json;
+    return;
+  }
+  var isRecordMode = false;
+  try {
+    isRecordMode = IsWprRecordMode();
+  } catch (err) {
+    status_element.textContent = err;
+    setTimeout(TryStart, 5000);
+    return;
+  }
+
+  if (!config["shouldStart"]) {
+    status_element.textContent =
+        "Press 'Start' to continue (or load this page with 'auto=1').";
+    return;
+  }
+
+  try {
+    var reportDir = dirname(dirname(window.location.pathname)) + "/common";
+    config["reportUrl"] = "file://" + reportDir + "/report.html";
+    config["isRecordMode"] = isRecordMode;
+    var port = chrome.extension.connect();
+    port.postMessage({message: "start", benchmark: config});
+    console.log("sending start message: page count, " +
+                config["pageSets"].length);
+  } catch(err) {
+    console.log("TryStart retrying after exception: " + err);
+    status_element.textContent = "Exception: " + err;
+    setTimeout(TryStart, 1000);
+    return;
+  }
+  status_element.textContent = "STARTING";
+}
+
+// We wait before starting the test just to let chrome warm up better.
+setTimeout(TryStart, 250);