Add a field trial to enable plugin power saver for all users.

components/content_settings/core/browser/plugins_field_trial.cc

 // Copyright 2015 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 "components/content_settings/core/browser/plugins_field_trial.h"
 
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
 #include "components/plugins/common/plugins_switches.h"
 
 namespace content_settings {
 
 // static
-const char PluginsFieldTrial::kFieldTrialName[] = "ForcePluginPowerSaver";
+const char PluginsFieldTrial::kForceFieldTrial[] = "ForcePluginPowerSaver";
+
+// static
+const char PluginsFieldTrial::kEnableFieldTrial[] = "PluginPowerSaver";
 
 // static
 ContentSetting PluginsFieldTrial::EffectiveContentSetting(
     ContentSettingsType type,
     ContentSetting setting) {
   if (type != CONTENT_SETTINGS_TYPE_PLUGINS)
     return setting;
 
   // For Plugins, ASK is obsolete. Show as BLOCK to reflect actual behavior.
   if (setting == ContentSetting::CONTENT_SETTING_ASK)
     return ContentSetting::CONTENT_SETTING_BLOCK;
 
   return setting;
 }
 
 // static
 bool PluginsFieldTrial::IsPluginPowerSaverEnabled() {
   const base::CommandLine* cl = base::CommandLine::ForCurrentProcess();
   if (cl->HasSwitch(plugins::switches::kDisablePluginPowerSaver))
     return false;
   if (cl->HasSwitch(plugins::switches::kEnablePluginPowerSaver))
     return true;
 
-  std::string group_name = base::FieldTrialList::FindFullName(kFieldTrialName);
-  return !group_name.empty() && group_name != "Disabled";
+  std::string group = base::FieldTrialList::FindFullName(kEnableFieldTrial);

[Bernhard Bauer, 2015/04/29 16:23:24]

According to go/finch-and-flags, you should get the trial group first, to ensure
that the experiment state is reported properly.

[Dan Beam, 2015/04/29 17:59:28]

Done.

+  if (!group.empty() && group != "Disabled")
+    return true;
+
+  group = base::FieldTrialList::FindFullName(kForceFieldTrial);
+  if (!group.empty() && group != "Disabled")
+    return true;
+
+  return false;
 }
 
 // static
 ContentSetting PluginsFieldTrial::GetDefaultPluginsContentSetting() {
   return IsPluginPowerSaverEnabled() ?
       ContentSetting::CONTENT_SETTING_DETECT_IMPORTANT_CONTENT :
       ContentSetting::CONTENT_SETTING_ALLOW;
 }
 
 }  // namespace content_settings