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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_FIELD_TRIAL_H_
#define CHROME_BROWSER_PRERENDER_PRERENDER_FIELD_TRIAL_H_
#include <string>
class CommandLine;
class Profile;
namespace prerender {
enum OmniboxHeuristic {
OMNIBOX_HEURISTIC_EXACT,
OMNIBOX_HEURISTIC_EXACT_FULL,
OMNIBOX_HEURISTIC_MAX
};
// 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 the heuristic to use when determining if prerendering should be
// attempted from the Omnibox. Governed by a field trial.
OmniboxHeuristic GetOmniboxHeuristicToUse();
// Returns the suffix to use for histograms dependent on which Omnibox heuristic
// is active.
std::string GetOmniboxHistogramSuffix();
} // namespace prerender
#endif // CHROME_BROWSER_PRERENDER_PRERENDER_FIELD_TRIAL_H_
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