1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef CHROME_BROWSER_PRERENDER_PRERENDER_FIELD_TRIAL_H_ 6 #define CHROME_BROWSER_PRERENDER_PRERENDER_FIELD_TRIAL_H_ 7 8 #include <string> 9 10 class CommandLine; 11 class Profile; 12 13 namespace prerender { 14 15 // Parse the --prerender= command line switch, which controls both prerendering 16 // and prefetching. If the switch is unset, or is set to "auto", then the user 17 // is assigned to a field trial. 18 void ConfigurePrefetchAndPrerender(const CommandLine& command_line); 19 20 // Returns true if the user has opted in or has been opted in to the 21 // prerendering from Omnibox experiment. 22 bool IsOmniboxEnabled(Profile* profile); 23 24 // Returns true iff the Prerender Local Predictor is enabled. 25 bool IsLocalPredictorEnabled(); 26 27 // Returns true iff the LoggedIn Predictor is enabled. 28 bool IsLoggedInPredictorEnabled(); 29 30 // Returns true iff the side-effect free whitelist is enabled. 31 bool IsSideEffectFreeWhitelistEnabled(); 32 33 // Returns true if the local predictor should actually launch prerenders. 34 bool IsLocalPredictorPrerenderLaunchEnabled(); 35 36 // Returns true if the local predictor should prerender, but only as control 37 // group. If the local predictor never launches prerenders, then this setting 38 // is irrelevant. 39 bool IsLocalPredictorPrerenderAlwaysControlEnabled(); 40 41 // Returns the TTL to be used for the local predictor. 42 int GetLocalPredictorTTLSeconds(); 43 44 // Returns the half-life time to use to decay local predictor prerender 45 // priorities. 46 int GetLocalPredictorPrerenderPriorityHalfLifeTimeSeconds(); 47 48 // Returns the maximum number of concurrent prerenders the local predictor 49 // may maintain. 50 int GetLocalPredictorMaxConcurrentPrerenders(); 51 52 // The following functions return whether certain LocalPredictor checks should 53 // be skipped, as indicated by the name. 54 bool SkipLocalPredictorFragment(); 55 bool SkipLocalPredictorHTTPS(); 56 bool SkipLocalPredictorWhitelist(); 57 bool SkipLocalPredictorLoggedIn(); 58 bool SkipLocalPredictorDefaultNoPrerender(); 59 60 } // namespace prerender 61 62 #endif // CHROME_BROWSER_PRERENDER_PRERENDER_FIELD_TRIAL_H_ 63
