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

components/plugins/common/plugins_field_trial.cc

Index: components/plugins/common/plugins_field_trial.cc
diff --git a/components/plugins/common/plugins_field_trial.cc b/components/plugins/common/plugins_field_trial.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c48e9534ea5be8696a392a5b5bdeebd1d6bf87cd
--- /dev/null
+++ b/components/plugins/common/plugins_field_trial.cc
@@ -0,0 +1,39 @@
+// 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/plugins/common/plugins_field_trial.h"
+
+#include "base/command_line.h"
+#include "base/metrics/field_trial.h"
+#include "components/plugins/common/plugins_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+  // For Plugins, ASK is obsolete.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 &&
+      EnableForcePluginPowerSaver()) {
+    return ContentSetting::CONTENT_SETTING_DETECT_IMPORTANT_CONTENT;
+  }
+
+  return setting;
+}
+
+bool PluginsFieldTrial::EnableForcePluginPowerSaver() {
+  const base::CommandLine* cl = base::CommandLine::ForCurrentProcess();
+  if (cl->HasSwitch(switches::kDisablePluginPowerSaver))
+    return false;
+  if (cl->HasSwitch(switches::kEnablePluginPowerSaver))
+    return true;
+
+  return base::FieldTrialList::FindFullName("ForcePluginPowerSaver") ==
+         "Enabled";
+}