Add a chrome://webapks page.

tools/gritsettings/resource_ids

 # Copyright (c) 2012 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.
 #
 # This file is used to assign starting resource ids for resources and strings
 # used by Chromium.  This is done to ensure that resource ids are unique
 # across all the grd files.  If you are adding a new grd file, please add
 # a new entry to this file.
 #
 # The entries below are organized into sections. When adding new entries,
@@ skipping 107 matching lines @@
   },
   "chrome/browser/resources/sync_file_system_internals_resources.grd": {
     "includes": [12520],
   },
   "chrome/browser/resources/task_scheduler_internals/resources.grd": {
     "includes": [12550],
   },
   "chrome/browser/resources/translate_internals_resources.grd": {
     "includes": [12560],
   },
+  "chrome/browser/resources/webapks_ui_resources.grd": {
+    "includes": [12570],
+  },
   # END chrome/browser section.
 
   # START chrome/ miscellaneous section.
   "chrome/common/common_resources.grd": {
     "includes": [12720],
   },
   "chrome/renderer/resources/renderer_resources.grd": {
     "includes": [12730],
     "structures": [12810],
   },
@@ skipping 212 matching lines @@
         "messages": [28650],
   },
   # END "everything else" section.
   # Everything but chrome/, components/, content/, and ios/
 
   # Thinking about appending to the end?
   # Please read the header and find the right section above instead.
 
   # Resource ids starting at 31000 are reserved for projects built on Chromium.
 }