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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/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "chrome/browser/prerender/prerender_histograms.h"
#include "chrome/browser/prerender/prerender_origin.h"
#include "content/public/browser/web_contents_observer.h"
#include "content/public/browser/web_contents_user_data.h"
#include "url/gurl.h"
namespace autofill {
struct PasswordForm;
}
namespace password_manager {
class PasswordManager;
}
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 content::WebContentsUserData<PrerenderTabHelper> {
public:
~PrerenderTabHelper() override;
// content::WebContentsObserver implementation.
void DidGetRedirectForResourceRequest(
content::RenderFrameHost* render_frame_host,
const content::ResourceRedirectDetails& details) override;
void DidStopLoading() override;
void DidStartProvisionalLoadForFrame(
content::RenderFrameHost* render_frame_host,
const GURL& validated_url,
bool is_error_page,
bool is_iframe_srcdoc) override;
void DidCommitProvisionalLoadForFrame(
content::RenderFrameHost* render_frame_host,
const GURL& validated_url,
ui::PageTransition transition_type) override;
// Called when the URL of the main frame changed, either when the load
// commits, or a redirect happens.
void MainFrameUrlDidChange(const GURL& url);
// Called when this prerendered WebContents has just been swapped in.
void PrerenderSwappedIn();
// Called when a control prerender is resolved. Applies to the next load.
void WouldHavePrerenderedNextLoad(Origin origin);
private:
explicit PrerenderTabHelper(content::WebContents* web_contents);
friend class content::WebContentsUserData<PrerenderTabHelper>;
void RecordPerceivedPageLoadTime(
base::TimeDelta perceived_page_load_time,
double fraction_plt_elapsed_at_swap_in);
// Retrieves the PrerenderManager, or NULL, if none was found.
PrerenderManager* MaybeGetPrerenderManager() const;
// Returns whether the WebContents being observed is currently prerendering.
bool IsPrerendering();
// The type the current pending navigation, if there is one. If the tab is a
// prerender before swap, the value is always NAVIGATION_TYPE_PRERENDERED,
// even if the prerender is not currently loading.
NavigationType navigation_type_;
// If |navigation_type_| is not NAVIGATION_TYPE_NORMAL, the origin of the
// relevant prerender. Otherwise, ORIGIN_NONE.
Origin origin_;
// True if the next load will be associated with a control prerender. This
// extra state is needed because control prerenders are resolved before the
// actual load begins. |next_load_origin_| gives the origin of the control
// prerender.
bool next_load_is_control_prerender_;
Origin next_load_origin_;
// System time at which the current load was started for the purpose of
// the perceived page load time (PPLT). If null, there is no current
// load.
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_;
base::WeakPtrFactory<PrerenderTabHelper> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(PrerenderTabHelper);
};
} // namespace prerender
#endif // CHROME_BROWSER_PRERENDER_PRERENDER_TAB_HELPER_H_
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