[MD settings] advanced toggle; add scrollWhenReady

chrome/browser/resources/settings/settings_main/compiled_resources2.gyp

 # Copyright 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.
 {
   'targets': [
     {
       'target_name': 'settings_main',
       'dependencies': [
+        '../settings_page/compiled_resources2.gyp:main_page_behavior',
         '../settings_page/compiled_resources2.gyp:settings_router',
       ],
       'includes': ['../../../../../third_party/closure_compiler/compile_js2.gypi'],
     },
   ],
 }