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// 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_BROWSER_PRERENDER_PRERENDER_OBSERVER_H_
#define CHROME_BROWSER_PRERENDER_PRERENDER_OBSERVER_H_
#pragma once
#include <list>
#include <vector>
#include "base/memory/scoped_ptr.h"
#include "base/time.h"
#include "content/browser/tab_contents/tab_contents_observer.h"
#include "googleurl/src/gurl.h"
class PrerenderContents;
class Profile;
class TabContents;
namespace prerender {
class PrerenderManager;
// PrerenderObserver is responsible for recording perceived pageload times
// to compare PLT's with prerendering enabled and disabled.
class PrerenderObserver : public TabContentsObserver {
public:
explicit PrerenderObserver(TabContents* tab_contents);
virtual ~PrerenderObserver();
// TabContentsObserver implementation.
virtual void ProvisionalChangeToMainFrameUrl(const GURL& url);
virtual bool OnMessageReceived(const IPC::Message& message);
// Message handler.
void OnDidStartProvisionalLoadForFrame(int64 frame_id,
bool main_frame,
const GURL& url);
virtual void DidStopLoading();
private:
// Retrieves the PrerenderManager, or NULL, if none was found.
PrerenderManager* MaybeGetPrerenderManager();
// Checks with the PrerenderManager if the specified URL has been preloaded,
// and if so, swap the RenderViewHost with the preload into this TabContents
// object.
bool MaybeUsePreloadedPage(const GURL& url);
// System time at which the current load was started for the purpose of
// the perceived page load time (PPLT).
base::TimeTicks pplt_load_start_;
DISALLOW_COPY_AND_ASSIGN(PrerenderObserver);
};
} // prerender
#endif // CHROME_BROWSER_PRERENDER_PRERENDER_OBSERVER_H_
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