1 files changed, 48 insertions, 0 deletions
diff --git a/chrome/renderer/playback_extension.cc b/chrome/renderer/playback_extension.cc
new file mode 100644
index 0000000..5f9f017
--- /dev/null
+++ b/chrome/renderer/playback_extension.cc
@@ -0,0 +1,48 @@
+// Copyright (c) 2011 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.
+
+#include "chrome/renderer/playback_extension.h"
+
+#include "v8/include/v8.h"
+
+const char kPlaybackExtensionName[] = "v8/PlaybackMode";
+
+namespace extensions_v8 {
+
+v8::Extension* PlaybackExtension::Get() {
+  v8::Extension* extension = new v8::Extension(
+      kPlaybackExtensionName,
+      "(function () {"
+      "  var orig_date = Date;"
+      "  var x = 0;"
+      "  var time_seed = 1204251968254;"
+      "  Math.random = function() {"
+      "    x += .1;"
+      "    return (x % 1);"
+      "  };"
+      "  Date = function() {"
+      "    if (this instanceof Date) {"
+      "      switch (arguments.length) {"
+      "        case 0: return new orig_date(time_seed += 50);"
+      "        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();"
+      "  };"
+      "})()");
+    return extension;
+}
+
+}  // namespace extensions_v8