Add a chrome://webapks page.

chrome/browser/ui/BUILD.gn

 # Copyright 2014 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/chromecast_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 547 matching lines @@
     "//components/update_client",
     "//components/upload_list",
     "//components/url_formatter",
     "//components/user_manager",
     "//components/user_prefs",
     "//components/variations",
     "//components/variations/service",
     "//components/version_ui",
     "//components/web_cache/browser",
     "//components/web_resource",
+    "//components/webapks_ui",
     "//components/zoom",
     "//content/app/resources",
     "//content/public/common",
     "//crypto",
     "//device/base",
     "//device/bluetooth/public/interfaces:experimental_interfaces",
     "//device/usb",
     "//extensions/features",
     "//media",
     "//net:net_with_v8",
@@ skipping 1677 matching lines @@
       "webui/offline/offline_internals_ui.cc",
       "webui/offline/offline_internals_ui.h",
       "webui/offline/offline_internals_ui_message_handler.cc",
       "webui/offline/offline_internals_ui_message_handler.h",
       "webui/popular_sites_internals_ui.cc",
       "webui/popular_sites_internals_ui.h",
       "webui/snippets_internals_message_handler.cc",
       "webui/snippets_internals_message_handler.h",
       "webui/snippets_internals_ui.cc",
       "webui/snippets_internals_ui.h",
+      "webui/webapks_handler.cc",
+      "webui/webapks_handler.h",
+      "webui/webapks_ui.cc",
+      "webui/webapks_ui.h",
     ]
     if (enable_vr_shell || enable_webvr) {
       if (enable_vr_shell) {
         defines += [ "ENABLE_VR_SHELL" ]
       }
       sources += [
         "webui/vr_shell/vr_shell_ui_message_handler.cc",
         "webui/vr_shell/vr_shell_ui_message_handler.h",
         "webui/vr_shell/vr_shell_ui_ui.cc",
         "webui/vr_shell/vr_shell_ui_ui.h",
@@ skipping 1210 matching lines @@
       "test/test_confirm_bubble_model.cc",
       "test/test_confirm_bubble_model.h",
     ]
     deps += [ "//chrome/test:test_support_ui" ]
   }
 
   if (enable_extensions) {
     deps += [ "//extensions/browser" ]
   }
 }