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      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 #include "chrome/browser/chrome_browser_field_trials.h"
      6 
      7 #include <string>
      8 
      9 #include "base/command_line.h"
     10 #include "base/metrics/field_trial.h"
     11 #include "base/prefs/pref_service.h"
     12 #include "base/strings/string_util.h"
     13 #include "base/time/time.h"
     14 #include "chrome/browser/metrics/gzipped_protobufs_field_trial.h"
     15 #include "chrome/browser/omnibox/omnibox_field_trial.h"
     16 #include "chrome/common/chrome_switches.h"
     17 #include "chrome/common/chrome_version_info.h"
     18 #include "chrome/common/metrics/variations/uniformity_field_trials.h"
     19 #include "chrome/common/pref_names.h"
     20 
     21 #if defined(OS_ANDROID) || defined(OS_IOS)
     22 #include "chrome/browser/chrome_browser_field_trials_mobile.h"
     23 #else
     24 #include "chrome/browser/chrome_browser_field_trials_desktop.h"
     25 #endif
     26 
     27 ChromeBrowserFieldTrials::ChromeBrowserFieldTrials(
     28     const CommandLine& parsed_command_line)
     29     : parsed_command_line_(parsed_command_line) {
     30 }
     31 
     32 ChromeBrowserFieldTrials::~ChromeBrowserFieldTrials() {
     33 }
     34 
     35 void ChromeBrowserFieldTrials::SetupFieldTrials(PrefService* local_state) {
     36   const base::Time install_time = base::Time::FromTimeT(
     37       local_state->GetInt64(prefs::kInstallDate));
     38   DCHECK(!install_time.is_null());
     39 
     40   // Field trials that are shared by all platforms.
     41   chrome_variations::SetupUniformityFieldTrials(install_time);
     42   metrics::CreateGzippedProtobufsFieldTrial();
     43   InstantiateDynamicTrials();
     44 
     45 #if defined(OS_ANDROID) || defined(OS_IOS)
     46   chrome::SetupMobileFieldTrials(
     47       parsed_command_line_, install_time, local_state);
     48 #else
     49   chrome::SetupDesktopFieldTrials(
     50       parsed_command_line_, install_time, local_state);
     51 #endif
     52 }
     53 
     54 void ChromeBrowserFieldTrials::InstantiateDynamicTrials() {
     55   // Call |FindValue()| on the trials below, which may come from the server, to
     56   // ensure they get marked as "used" for the purposes of data reporting.
     57   base::FieldTrialList::FindValue("UMA-Dynamic-Binary-Uniformity-Trial");
     58   base::FieldTrialList::FindValue("UMA-Dynamic-Uniformity-Trial");
     59   base::FieldTrialList::FindValue("InstantDummy");
     60   base::FieldTrialList::FindValue("InstantChannel");
     61   base::FieldTrialList::FindValue("Test0PercentDefault");
     62   // MouseEventPreconnect trial is used from renderer process.
     63   // Mark here so it will be sync-ed.
     64   base::FieldTrialList::FindValue("MouseEventPreconnect");
     65   // Activate the autocomplete dynamic field trials.
     66   OmniboxFieldTrial::ActivateDynamicTrials();
     67 }
     68