| // Copyright 2013 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. |
| |
| #include "chrome/browser/chrome_browser_field_trials_mobile.h" |
| |
| #include <string> |
| |
| #include "base/command_line.h" |
| #include "base/metrics/field_trial.h" |
| #include "base/prefs/pref_service.h" |
| #include "chrome/common/chrome_switches.h" |
| #include "chrome/common/chrome_version_info.h" |
| |
| namespace chrome { |
| |
| namespace { |
| |
| // Base function used by all data reduction proxy field trials. A trial is |
| // only conducted for installs that are in the "Enabled" group. They are always |
| // enabled on DEV and BETA channels, and for STABLE, a percentage will be |
| // controlled from the server. Until the percentage is learned from the server, |
| // a client-side configuration is used. |
| void DataCompressionProxyBaseFieldTrial( |
| const char* trial_name, |
| const base::FieldTrial::Probability enabled_group_probability, |
| const base::FieldTrial::Probability total_probability) { |
| const char kEnabled[] = "Enabled"; |
| const char kDisabled[] = "Disabled"; |
| |
| // Find out if this is a stable channel. |
| const bool kIsStableChannel = |
| chrome::VersionInfo::GetChannel() == chrome::VersionInfo::CHANNEL_STABLE; |
| |
| // Experiment enabled until Jan 1, 2015. By default, disabled. |
| scoped_refptr<base::FieldTrial> trial( |
| base::FieldTrialList::FactoryGetFieldTrial( |
| trial_name, |
| total_probability, |
| kDisabled, 2015, 1, 1, base::FieldTrial::ONE_TIME_RANDOMIZED, NULL)); |
| |
| // Non-stable channels will run with probability 1. |
| const int kEnabledGroup = trial->AppendGroup( |
| kEnabled, |
| kIsStableChannel ? enabled_group_probability : total_probability); |
| |
| const int v = trial->group(); |
| VLOG(1) << trial_name << " enabled group id: " << kEnabledGroup |
| << ". Selected group id: " << v; |
| } |
| |
| void DataCompressionProxyFieldTrials() { |
| // Governs the rollout of the compression proxy for Chrome on mobile |
| // platforms. Always enabled in DEV and BETA channels. For STABLE, the |
| // percentage will be controlled from the server, and is configured to be |
| // 10% = 100 / 1000 until overridden by the server. |
| DataCompressionProxyBaseFieldTrial( |
| "DataCompressionProxyRollout", 100, 1000); |
| |
| if (base::FieldTrialList::FindFullName( |
| "DataCompressionProxyRollout") == "Enabled") { |
| |
| // Governs the rollout of the _promo_ for the compression proxy |
| // independently from the rollout of compression proxy. The enabled |
| // percentage is configured to be 100% = 1000 / 1000 until overridden by the |
| // server. When this trial is "Enabled," users get a promo, whereas |
| // otherwise, compression is enabled without a promo. |
| DataCompressionProxyBaseFieldTrial( |
| "DataCompressionProxyPromoVisibility", 1000, 1000); |
| } |
| } |
| |
| } // namespace |
| |
| void SetupMobileFieldTrials(const CommandLine& parsed_command_line, |
| const base::Time& install_time, |
| PrefService* local_state) { |
| DataCompressionProxyFieldTrials(); |
| } |
| |
| } // namespace chrome |