Prerendered pages are swapped in at browser::Navigate time.

chrome/renderer/prerender/prerender_dispatcher.h

Index: chrome/renderer/prerender/prerender_dispatcher.h
diff --git a/chrome/renderer/prerender/prerender_dispatcher.h b/chrome/renderer/prerender/prerender_dispatcher.h
new file mode 100644
index 0000000000000000000000000000000000000000..f6c37a2e999a55b0ce4c3937f0eb0bf32f186d96
--- /dev/null
+++ b/chrome/renderer/prerender/prerender_dispatcher.h
@@ -0,0 +1,36 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.

[dominich, 2012/02/28 16:21:00]

nit: 2012

[cbentzel, 2012/02/29 18:16:13]

Done.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_RENDERER_PRERENDER_PRERENDER_DISPATCHER_H_
+#define CHROME_RENDERER_PRERENDER_PRERENDER_DISPATCHER_H_
+#pragma once
+
+#include <map>
+
+#include "base/compiler_specific.h"
+#include "content/public/renderer/render_process_observer.h"
+
+class GURL;
+
+namespace prerender {
+
+// PrerenderDispatcher pays attention to which URLs are prerendered.

[dominich, 2012/02/28 16:21:00]

nit: 'pays attention to' is a bit vague. What does it actually do with them? Who
owns this? Is there only one instance, or one per render process?

[cbentzel, 2012/02/29 18:16:13]

Improved description.

+class PrerenderDispatcher : public content::RenderProcessObserver {
+ public:
+  bool IsPrerenderURL(const GURL & url) const;
+
+ private:
+  void OnAddPrerenderURL(const GURL& url);
+  void OnRemovePrerenderURL(const GURL& url);
+
+  // RenderProcessObserver:
+  virtual bool OnControlMessageReceived(const IPC::Message& message) OVERRIDE;
+
+  typedef std::map<GURL, int> PrerenderMap;
+  std::map<GURL, int> prerender_urls_;

[dominich, 2012/02/28 16:21:00]

nit: use PrerenderMap in this declaration.

[cbentzel, 2012/02/29 18:16:13]

Nice catch. Done.

+};
+
+}  // namespace prerender
+
+#endif  // CHROME_RENDERER_PRERENDER_PRERENDER_HELPER_H_