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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/common/chrome_switches.h"
     15 #include "chrome/common/chrome_version_info.h"
     16 #include "chrome/common/variations/uniformity_field_trials.h"
     17 #include "components/metrics/metrics_pref_names.h"
     18 #include "components/omnibox/omnibox_field_trial.h"
     19 
     20 #if defined(OS_ANDROID) || defined(OS_IOS)
     21 #include "chrome/browser/chrome_browser_field_trials_mobile.h"
     22 #else
     23 #include "chrome/browser/chrome_browser_field_trials_desktop.h"
     24 #endif
     25 
     26 ChromeBrowserFieldTrials::ChromeBrowserFieldTrials(
     27     const CommandLine& parsed_command_line)
     28     : parsed_command_line_(parsed_command_line) {
     29 }
     30 
     31 ChromeBrowserFieldTrials::~ChromeBrowserFieldTrials() {
     32 }
     33 
     34 void ChromeBrowserFieldTrials::SetupFieldTrials(const base::Time& install_time,
     35                                                 PrefService* local_state) {
     36   DCHECK(!install_time.is_null());
     37 
     38   // Field trials that are shared by all platforms.
     39   chrome_variations::SetupUniformityFieldTrials(install_time);
     40   InstantiateDynamicTrials();
     41 
     42 #if defined(OS_ANDROID) || defined(OS_IOS)
     43   chrome::SetupMobileFieldTrials(parsed_command_line_);
     44 #else
     45   chrome::SetupDesktopFieldTrials(
     46       parsed_command_line_, local_state);
     47 #endif
     48 }
     49 
     50 void ChromeBrowserFieldTrials::InstantiateDynamicTrials() {
     51   // The following trials are used from renderer process.
     52   // Mark here so they will be sync-ed.
     53   base::FieldTrialList::FindValue("CLD1VsCLD2");
     54   base::FieldTrialList::FindValue("MouseEventPreconnect");
     55   base::FieldTrialList::FindValue("UnauthorizedPluginInfoBar");
     56   base::FieldTrialList::FindValue("DisplayList2dCanvas");
     57   base::FieldTrialList::FindValue("V8ScriptStreaming");
     58   // Activate the autocomplete dynamic field trials.
     59   OmniboxFieldTrial::ActivateDynamicTrials();
     60 }
     61