Make DETECT_IMPORTANT_CONTENT the default Plugins content setting based

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";
+
+// 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+  // For Plugins, ASK is obsolete.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";
+}
+
+// static
+ContentSetting PluginsFieldTrial::GetDefaultPluginsContentSetting() {
+  return IsPluginPowerSaverEnabled() ?
+      ContentSetting::CONTENT_SETTING_DETECT_IMPORTANT_CONTENT :
+      ContentSetting::CONTENT_SETTING_ALLOW;
+}
+
+}  // namespace content_settings