Check in the thirdparty libs needed for webkitpy.

Tools/Scripts/webkitpy/thirdparty/webpagereplay/deterministic.js

Index: Tools/Scripts/webkitpy/thirdparty/webpagereplay/deterministic.js
diff --git a/Tools/Scripts/webkitpy/thirdparty/webpagereplay/deterministic.js b/Tools/Scripts/webkitpy/thirdparty/webpagereplay/deterministic.js
new file mode 100644
index 0000000000000000000000000000000000000000..291c0c59d230d1411e4e0bb086a87ffbf9f82fe3
--- /dev/null
+++ b/Tools/Scripts/webkitpy/thirdparty/webpagereplay/deterministic.js
@@ -0,0 +1,42 @@
+(function () {
+  var orig_date = Date;
+  var random_count = 0;
+  var date_count = 0;
+  var random_seed = 0.462;
+  var time_seed = 1204251968254;
+  var random_count_threshold = 25;
+  var date_count_threshold = 25;
+  Math.random = function() {
+    random_count++;
+    if (random_count > random_count_threshold){
+     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){
+        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();
+  };
+})();