Plugin Power Saver: Overhaul plugin-power-saver flags. Show in UI.

components/plugins/common/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_PLUGINS_COMMON_PLUGINS_FIELD_TRIAL_H_
+#define COMPONENTS_PLUGINS_COMMON_PLUGINS_FIELD_TRIAL_H_
+
+#include "base/macros.h"
+#include "components/content_settings/core/common/content_settings.h"
+#include "components/content_settings/core/common/content_settings_types.h"
+
+// This class manages the Plugins field trials.
+class PluginsFieldTrial {
+ public:
+  // 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 forced on, overriding
+  // the user's Content Settings.
+  static bool IsForcePluginPowerSaverEnabled();
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(PluginsFieldTrial);
+};
+
+#endif  // COMPONENTS_PLUGINS_COMMON_PLUGINS_FIELD_TRIAL_H_