Run Chrome Endure tests with network simulation via Web Page Replay.

chrome/test/data/chrome_endure/deterministic.js

+/*

[dennis_jeffrey, 2012/07/24 00:39:35]

could we give this file a new name?  Something to indicate that it is related to
WebPageReplay.  Maybe something like "wpr_deterministic.js".

[fdeng1, 2012/07/24 04:30:05]

Done.

+ * Copyright 2012, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */

[dennis_jeffrey, 2012/07/24 00:39:35]

We should probably use the regular 3-line chromium license header here.

[fdeng1, 2012/07/24 04:30:05]

Done.

+
+/*
+ * The scripts in this file will be injected to the http responses when
+ * simulating network via Web Page Replay for Chrome Endure tests.
+ *
+ * If you need to modify this scripts, make sure that you use the same version
+ * of this scripts in both record and replay mode.

[dennis_jeffrey, 2012/07/24 00:39:35]

you might want to mention that this script is adapted from some code in WPR
itself (you could add a link to the original file where you took this code
from).  Then you can mention what you've changed (i.e., the time seed).

[fdeng1, 2012/07/24 04:30:05]

Done.

+ *
+ * TODO(fdeng): Currently the time_seed is set to a date far in the future.
+ * This might cause problems but it is the workaround for Endure tests for
+ * Google apps like Gmail. A better way to go is to revise the time_seed to
+ * current time each time we record and use the revised scripts for replay.
+ * This can be achieved by modifying Web Page Replay to automaticly

[dennis_jeffrey, 2012/07/24 00:39:35]

automaticly --> automatically

[fdeng1, 2012/07/24 04:30:05]

Done.

+ * revise and save scripts in the archive in record mode and read it
+ * from the archive in replay mode.
+ */
+(function () {
+  var orig_date = Date;
+  var random_count = 0;
+  var date_count = 0;
+  var random_seed = 0.462;
+  var time_seed = 3204251968254;

[dennis_jeffrey, 2012/07/24 00:39:35]

var time_seed = 3204251968254;  # Changed from default WebPageReplay value.

[fdeng1, 2012/07/24 04:30:05]

Done.

+  var random_count_threshold = 25;
+  var date_count_threshold = 25;
+  Math.random = function() {
+    random_count++;
+    if (random_count > random_count_threshold){

[dennis_jeffrey, 2012/07/24 00:39:35]

add a space right before {

[fdeng1, 2012/07/24 04:30:05]

Done.

+     random_seed += 0.1;
+     random_count = 1;
+    }
+    return (random_seed % 1);
+  };
+  Date = function() {
+    if (this instanceof Date) {
+      date_count++;
+      if (date_count > date_count_threshold){

[dennis_jeffrey, 2012/07/24 00:39:35]

add a space right before {

[fdeng1, 2012/07/24 04:30:05]

Done.

+        time_seed += 50;
+        date_count = 1;
+      }
+      switch (arguments.length) {
+      case 0: return new orig_date(time_seed);
+      case 1: return new orig_date(arguments[0]);
+      default: return new orig_date(arguments[0], arguments[1],
+         arguments.length >= 3 ? arguments[2] : 1,
+         arguments.length >= 4 ? arguments[3] : 0,
+         arguments.length >= 5 ? arguments[4] : 0,
+         arguments.length >= 6 ? arguments[5] : 0,
+         arguments.length >= 7 ? arguments[6] : 0);
+      }
+    }
+    return new Date().toString();
+  };
+  Date.__proto__ = orig_date;
+  Date.prototype.constructor = Date;
+  orig_date.now = function() {
+    return new Date().getTime();
+  };
+})();