chrome/browser/prerender/prerender_field_trial.h

// 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_FIELD_TRIAL_H_
#define CHROME_BROWSER_PRERENDER_PRERENDER_FIELD_TRIAL_H_

#include <string>

class CommandLine;
class Profile;

namespace prerender {

// Parse the --prerender= command line switch, which controls both prerendering
// and prefetching.  If the switch is unset, or is set to "auto", then the user
// is assigned to a field trial.
void ConfigurePrefetchAndPrerender(const CommandLine& command_line);

// Returns true if the user has opted in or has been opted in to the
// prerendering from Omnibox experiment.
bool IsOmniboxEnabled(Profile* profile);

// Returns true iff the Prerender Local Predictor is enabled.
bool IsLocalPredictorEnabled();

// Returns true iff the LoggedIn Predictor is enabled.
bool IsLoggedInPredictorEnabled();

// Returns true iff the side-effect free whitelist is enabled.
bool IsSideEffectFreeWhitelistEnabled();

// Returns true if the local predictor should actually launch prerenders.
bool IsLocalPredictorPrerenderLaunchEnabled();

// Returns true if the local predictor should prerender, but only as control
// group. If the local predictor never launches prerenders, then this setting
// is irrelevant.
bool IsLocalPredictorPrerenderAlwaysControlEnabled();

// Returns the TTL to be used for the local predictor.
int GetLocalPredictorTTLSeconds();

// Returns the half-life time to use to decay local predictor prerender
// priorities.
int GetLocalPredictorPrerenderPriorityHalfLifeTimeSeconds();

// Returns the maximum number of concurrent prerenders the local predictor
// may maintain.
int GetLocalPredictorMaxConcurrentPrerenders();

// The following functions return whether certain LocalPredictor checks should
// be skipped, as indicated by the name.
bool SkipLocalPredictorFragment();
bool SkipLocalPredictorHTTPS();
bool SkipLocalPredictorWhitelist();
bool SkipLocalPredictorLoggedIn();
bool SkipLocalPredictorDefaultNoPrerender();

}  // namespace prerender

#endif  // CHROME_BROWSER_PRERENDER_PRERENDER_FIELD_TRIAL_H_