MD Settings: make <paper-drawer-panel> flip in RTL

chrome/browser/resources/settings/settings_ui/settings_ui.js

 // 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.
 
 /**
  * @fileoverview
  * 'settings-ui' implements the UI for the Settings page.
  *
  * Example:
  *
  *    <settings-ui prefs="{{prefs}}"></settings-ui>
  *
  * @group Chrome Settings Elements
  * @element settings-ui
  */
 Polymer({
   is: 'settings-ui',
 
   properties: {
     /**
      * Preferences state.
      * @type {?CrSettingsPrefsElement}
      */
     prefs: Object,
+
+    /** @type {?settings.DirectionDelegate} */
+    directionDelegate: {
+      observer: 'directionDelegateChanged_',
+      type: Object,
+    },
+  },
+
+  /** @private */
+  directionDelegateChanged_: function() {
+    this.$.panel.rightDrawer = this.directionDelegate.isRtl();
   },
 });