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

chrome/browser/plugins/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 "chrome/browser/plugins/plugins_field_trial.h"
+
+#include "base/command_line.h"
+#include "base/metrics/field_trial.h"
+#include "chrome/common/chrome_switches.h"
+
+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+  // For Plugins, ASK is obsolete.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;
+
+  // For Plugins, allow flag to override displayed content setting.
+  if (setting == ContentSetting::CONTENT_SETTING_ALLOW &&
+      IsForcePluginPowerSaverEnabled()) {
+    return ContentSetting::CONTENT_SETTING_DETECT_IMPORTANT_CONTENT;
+  }
+
+  return setting;
+}
+
+bool PluginsFieldTrial::IsForcePluginPowerSaverEnabled() {
+  const base::CommandLine* cl = base::CommandLine::ForCurrentProcess();
+  if (cl->HasSwitch(switches::kDisablePluginPowerSaver))
+    return false;
+  if (cl->HasSwitch(switches::kEnablePluginPowerSaver))
+    return true;
+
+  std::string group_name =
+      base::FieldTrialList::FindFullName("ForcePluginPowerSaver");
+  return !group_name.empty() && group_name != "Disabled";
+}