Implement extension controlled indicators, starting with New Tab page

chrome/browser/resources/settings/on_startup_page/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': 'on_startup_page',
+      'target_name': 'on_startup_browser_proxy',
+      'dependencies': [
+        '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:assert',
+        '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:cr',
+      ],
       'includes': ['../../../../../third_party/closure_compiler/compile_js2.gypi'],
     },
     {
+      'target_name': 'on_startup_page',
+      'dependencies': [
+        'on_startup_browser_proxy',
+      ],
+      'includes': ['../../../../../third_party/closure_compiler/compile_js2.gypi'],
+    },
+    {
       'target_name': 'startup_urls_page',
       'dependencies': [
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:assert',
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:cr',
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:web_ui_listener_behavior',
         '<(DEPTH)/ui/webui/resources/cr_elements/compiled_resources2.gyp:cr_scrollable_behavior',
         'startup_urls_page_browser_proxy',
         'startup_url_entry',
       ],
       'includes': ['../../../../../third_party/closure_compiler/compile_js2.gypi'],
@@ skipping 13 matching lines @@
         '<(DEPTH)/ui/webui/resources/cr_elements/cr_action_menu/compiled_resources2.gyp:cr_action_menu',
         '<(DEPTH)/ui/webui/resources/cr_elements/cr_lazy_render/compiled_resources2.gyp:cr_lazy_render',
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:cr',
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:icon',
         'startup_urls_page_browser_proxy',
       ],
       'includes': ['../../../../../third_party/closure_compiler/compile_js2.gypi'],
     },
   ],
 }