chrome/renderer/playback_extension.h

// 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.

#ifndef CHROME_RENDERER_PLAYBACK_EXTENSION_H_
#define CHROME_RENDERER_PLAYBACK_EXTENSION_H_

namespace v8 {
class Extension;
}

namespace extensions_v8 {

// Inject code which overrides a few common JS functions for implementing
// randomness.  In order to implement effective record & playback of
// websites, it is important that the URLs not change.  Many popular web
// based apps use randomness in URLs to unique-ify urls for proxies.
// Unfortunately, this breaks playback.
// To work around this, we take the two most common client-side randomness
// generators and make them constant.  They really need to be constant
// (rather than a constant seed followed by constant change)
// because the playback mode wants flexibility in how it plays them back
// and cannot always guarantee that requests for randomness are played back
// in exactly the same order in which they were recorded.
class PlaybackExtension {
 public:
  static v8::Extension* Get();
};

}  // namespace extensions_v8

#endif  // CHROME_RENDERER_PLAYBACK_EXTENSION_H_