1// Copyright (c) 2011 The Chromium Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5#ifndef CHROME_RENDERER_PLAYBACK_EXTENSION_H_ 6#define CHROME_RENDERER_PLAYBACK_EXTENSION_H_ 7 8namespace v8 { 9class Extension; 10} 11 12namespace extensions_v8 { 13 14// Inject code which overrides a few common JS functions for implementing 15// randomness. In order to implement effective record & playback of 16// websites, it is important that the URLs not change. Many popular web 17// based apps use randomness in URLs to unique-ify urls for proxies. 18// Unfortunately, this breaks playback. 19// To work around this, we take the two most common client-side randomness 20// generators and make them constant. They really need to be constant 21// (rather than a constant seed followed by constant change) 22// because the playback mode wants flexibility in how it plays them back 23// and cannot always guarantee that requests for randomness are played back 24// in exactly the same order in which they were recorded. 25class PlaybackExtension { 26 public: 27 static v8::Extension* Get(); 28}; 29 30} // namespace extensions_v8 31 32#endif // CHROME_RENDERER_PLAYBACK_EXTENSION_H_ 33