Add a chrome://webapks page.

chrome/chrome_paks.gni

 # 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.
 
 import("//build/config/locales.gni")
 import("//chrome/common/features.gni")
 import("//extensions/features/features.gni")
 import("//ui/base/ui_features.gni")
 import("chrome_repack_locales.gni")
 
@@ skipping 80 matching lines @@
       "$root_gen_dir/blink/public/resources/blink_resources.pak",
       "$root_gen_dir/chrome/browser_resources.pak",
       "$root_gen_dir/chrome/chrome_unscaled_resources.pak",
       "$root_gen_dir/chrome/common_resources.pak",
       "$root_gen_dir/chrome/invalidations_resources.pak",
       "$root_gen_dir/chrome/net_internals_resources.pak",
       "$root_gen_dir/chrome/password_manager_internals_resources.pak",
       "$root_gen_dir/chrome/policy_resources.pak",
       "$root_gen_dir/chrome/task_scheduler_internals_resources.pak",
       "$root_gen_dir/chrome/translate_internals_resources.pak",
+      "$root_gen_dir/chrome/webapks_ui_resources.pak",
       "$root_gen_dir/components/components_resources.pak",
       "$root_gen_dir/content/browser/tracing/tracing_resources.pak",
       "$root_gen_dir/content/content_resources.pak",
       "$root_gen_dir/net/net_resources.pak",
       "$root_gen_dir/ui/resources/webui_resources.pak",
     ]
     deps = [
       "//chrome/app/theme:chrome_unscaled_resources",
       "//chrome/browser:resources",
       "//chrome/browser/resources:invalidations_resources",
@@ skipping 151 matching lines @@
       ":${target_name}_locales",
     ]
     if (enable_hidpi) {
       public_deps += [ ":${target_name}_200_percent" ]
     }
     if (defined(invoker.public_deps)) {
       public_deps += invoker.public_deps
     }
   }
 }