Add pref to enable/disable palette tray.

chrome/browser/ui/webui/options/chromeos/options_stylus_handler.cc

 // Copyright (c) 2016 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/ui/webui/options/chromeos/options_stylus_handler.h"
 
 #include "ash/common/system/chromeos/palette/palette_utils.h"
 #include "chrome/grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 
@@ skipping 10 matching lines @@
 
   RegisterTitle(localized_strings, "stylusOverlay", IDS_SETTINGS_STYLUS_TITLE);
 
   localized_strings->SetString(
       "stylusSettingsButtonTitle",
       l10n_util::GetStringUTF16(IDS_SETTINGS_STYLUS_TITLE));
   localized_strings->SetString(
       "stylusAutoOpenStylusTools",
       l10n_util::GetStringUTF16(IDS_SETTINGS_STYLUS_AUTO_OPEN_STYLUS_TOOLS));
   localized_strings->SetString(
+      "stylusEnableStylusTools",
+      l10n_util::GetStringUTF16(IDS_SETTINGS_STYLUS_ENABLE_STYLUS_TOOLS));
+  localized_strings->SetString(
       "stylusFindMoreApps",
       l10n_util::GetStringUTF16(IDS_SETTINGS_STYLUS_FIND_MORE_APPS));
 
-  localized_strings->SetBoolean("showStylusSettings", ash::IsPaletteEnabled());
+  localized_strings->SetBoolean("showStylusSettings",
+                                ash::IsPaletteFeatureEnabled());
 }
 
 void OptionsStylusHandler::InitializePage() {}
 
 void OptionsStylusHandler::RegisterMessages() {}
 
 }  // namespace options
 }  // namespace chromeos