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

components/content_settings/core/browser/plugins_field_trial.h

 // 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.
 
 #ifndef COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_H_
 #define COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_H_
 
 #include "base/macros.h"
 #include "components/content_settings/core/common/content_settings.h"
 #include "components/content_settings/core/common/content_settings_types.h"
 
 namespace content_settings {
 
 // This class manages the Plugins field trials.
 class PluginsFieldTrial {
  public:
-  static const char kFieldTrialName[];
+  // A legacy field trial used to dogfood Plugin Power Saver. Remove soon.
+  static const char kForceFieldTrial[];
+
+  // The field trial responsible for rolling out Plugin Power Saver to users.
+  static const char kEnableFieldTrial[];
 
   // Returns the effective content setting for plugins. Passes non-plugin
   // content settings through without modification.
   static ContentSetting EffectiveContentSetting(ContentSettingsType type,
                                                 ContentSetting setting);
 
   // Returns true if the Plugin Power Saver feature is enabled.
   static bool IsPluginPowerSaverEnabled();
 
   // Get the default plugins content setting based on field trials/flags.
   static ContentSetting GetDefaultPluginsContentSetting();
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PluginsFieldTrial);
 };
 
 }  // namespace content_settings
 
 #endif  // COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_H_