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// Copyright (c) 2012 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_TAB_HELPER_H_
#define CHROME_BROWSER_PRERENDER_PRERENDER_TAB_HELPER_H_
#include "base/time.h"
#include "base/memory/scoped_ptr.h"
#include "content/public/browser/web_contents_observer.h"
#include "googleurl/src/gurl.h"
class TabContentsWrapper;
namespace prerender {
class PrerenderManager;
// PrerenderTabHelper is responsible for recording perceived pageload times
// to compare PLT's with prerendering enabled and disabled.
class PrerenderTabHelper : public content::WebContentsObserver {
public:
explicit PrerenderTabHelper(TabContentsWrapper* tab);
virtual ~PrerenderTabHelper();
// content::WebContentsObserver implementation.
virtual void ProvisionalChangeToMainFrameUrl(
const GURL& url,
const GURL& opener_url) OVERRIDE;
virtual void DidStopLoading() OVERRIDE;
virtual void DidStartProvisionalLoadForFrame(
int64 frame_id,
bool is_main_frame,
const GURL& validated_url,
bool is_error_page,
content::RenderViewHost* render_view_host) OVERRIDE;
virtual void DidCommitProvisionalLoadForFrame(
int64 frame_id,
bool is_main_frame,
const GURL& validated_url,
content::PageTransition transition_type) OVERRIDE;
// Called when this prerendered TabContents has just been swapped in.
void PrerenderSwappedIn();
private:
// Helper class to compute pixel-based stats on the paint progress
// between when a prerendered page is swapped in and when the onload event
// fires.
class PixelStats;
scoped_ptr<PixelStats> pixel_stats_;
// Retrieves the PrerenderManager, or NULL, if none was found.
PrerenderManager* MaybeGetPrerenderManager() const;
// Returns whether the WebContents being observed is currently prerendering.
bool IsPrerendering();
// Returns whether the WebContents being observed was prerendered.
bool IsPrerendered();
bool IsTopSite(const GURL& url);
// TabContentsWrapper we're created for.
TabContentsWrapper* tab_;
// System time at which the current load was started for the purpose of
// the perceived page load time (PPLT).
base::TimeTicks pplt_load_start_;
// System time at which the actual pageload started (pre-swapin), if
// a applicable (in cases when a prerender that was still loading was
// swapped in).
base::TimeTicks actual_load_start_;
// Current URL being loaded.
GURL url_;
DISALLOW_COPY_AND_ASSIGN(PrerenderTabHelper);
};
} // namespace prerender
#endif // CHROME_BROWSER_PRERENDER_PRERENDER_TAB_HELPER_H_
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