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

chrome/browser/ui/website_settings/website_settings_ui.cc

Index: chrome/browser/ui/website_settings/website_settings_ui.cc
diff --git a/chrome/browser/ui/website_settings/website_settings_ui.cc b/chrome/browser/ui/website_settings/website_settings_ui.cc
index 210b5f5a17045f2146dca74d6e18a6e98578982d..2d9b91e24fd8720ad21a25e3cd10405455ce55b9 100644
--- a/chrome/browser/ui/website_settings/website_settings_ui.cc
+++ b/chrome/browser/ui/website_settings/website_settings_ui.cc
@@ -6,6 +6,7 @@
 
 #include "chrome/grit/chromium_strings.h"
 #include "chrome/grit/generated_resources.h"
+#include "components/plugins/common/plugins_field_trial.h"
 #include "grit/theme_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
@@ -179,11 +180,19 @@ base::string16 WebsiteSettingsUI::PermissionActionToUIString(
   if (effective_setting == CONTENT_SETTING_DEFAULT) {
     effective_setting = default_setting;
 
+#if defined(ENABLE_PLUGINS)
+    // For Plugins, allow flag to override displayed content setting.
     // For Plugins, ASK is obsolete. Show as BLOCK to reflect actual behavior.
-    if (type == CONTENT_SETTINGS_TYPE_PLUGINS &&
-        default_setting == CONTENT_SETTING_ASK) {
-      effective_setting = CONTENT_SETTING_BLOCK;
+    if (type == CONTENT_SETTINGS_TYPE_PLUGINS) {
+      if (default_setting == ContentSetting::CONTENT_SETTING_ALLOW &&
+          PluginsFieldTrial::EnableForcePluginPowerSaver()) {
+        effective_setting =
+            ContentSetting::CONTENT_SETTING_DETECT_IMPORTANT_CONTENT;
+      } else if (default_setting == CONTENT_SETTING_ASK) {
+        effective_setting = CONTENT_SETTING_BLOCK;
+      }
     }
+#endif  // defined(ENABLE_PLUGINS)
   }
 
   const int* button_text_ids = NULL;