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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/component_updater/pepper_flash_field_trial.h" | |
| 6 | |
| 7 #include "base/command_line.h" | |
| 8 #include "base/memory/ref_counted.h" | |
| 9 #include "base/metrics/field_trial.h" | |
| 10 #include "chrome/common/chrome_switches.h" | |
| 11 | |
| 12 namespace { | |
| 13 | |
| 14 const char* const kFieldTrialName = "PepperFlash"; | |
| 15 const char* const kDisableGroupName = "DisableByDefault"; | |
| 16 const char* const kEnableGroupName = "EnableByDefault"; | |
| 17 int g_disabled_group_number = -1; | |
| 18 | |
| 19 void ActivateFieldTrial() { | |
| 20 // The field trial will expire on Jan 1st, 2014. | |
| 21 scoped_refptr<base::FieldTrial> trial( | |
| 22 base::FieldTrialList::FactoryGetFieldTrial( | |
| 23 kFieldTrialName, 1000, kDisableGroupName, 2014, 1, 1, | |
| 24 &g_disabled_group_number)); | |
| 25 | |
| 26 CommandLine* command_line = CommandLine::ForCurrentProcess(); | |
| 27 if (command_line->HasSwitch(switches::kPpapiFlashFieldTrial)) { | |
| 28 std::string switch_value = | |
| 29 command_line->GetSwitchValueASCII(switches::kPpapiFlashFieldTrial); | |
| 30 if (switch_value == switches::kPpapiFlashFieldTrialEnableByDefault) { | |
| 31 trial->AppendGroup(kEnableGroupName, 1000); | |
| 32 return; | |
| 33 } else if (switch_value == | |
| 34 switches::kPpapiFlashFieldTrialDisableByDefault) { | |
| 35 return; | |
| 36 } | |
| 37 } | |
| 38 | |
| 39 // Disable by default if one time randomization is not available. | |
| 40 if (!base::FieldTrialList::IsOneTimeRandomizationEnabled()) | |
| 41 return; | |
| 42 | |
| 43 trial->UseOneTimeRandomization(); | |
| 44 // 50% goes into the enable-by-default group. | |
| 45 trial->AppendGroup(kEnableGroupName, 500); | |
| 46 } | |
| 47 | |
| 48 } // namespace | |
| 49 | |
| 50 // static | |
| 51 bool PepperFlashFieldTrial::InEnableByDefaultGroup() { | |
| 52 static bool activated = false; | |
| 53 if (!activated) { | |
| 54 ActivateFieldTrial(); | |
| 55 activated = true; | |
| 56 } | |
| 57 | |
| 58 int group = base::FieldTrialList::FindValue(kFieldTrialName); | |
| 59 return group != base::FieldTrial::kNotFinalized && | |
| 60 group != g_disabled_group_number; | |
| 61 } | |
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