Add chrome://site-tiles-internals/

ios/chrome/browser/ui/webui/BUILD.gn

 # 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.
 
 source_set("webui") {
   configs += [ "//build/config/compiler:enable_arc" ]
   sources = [
     "about_ui.cc",
     "about_ui.h",
     "crashes_ui.cc",
     "crashes_ui.h",
     "flags_ui.cc",
     "flags_ui.h",
     "mojo_web_ui_ios_controller.h",
+    "ntp_tiles_internals_ui.cc",
+    "ntp_tiles_internals_ui.h",
     "physical_web_ui.cc",
     "physical_web_ui.h",
     "popular_sites_internals_ui.cc",
     "popular_sites_internals_ui.h",
     "version_handler.cc",
     "version_handler.h",
     "version_ui.h",
     "version_ui.mm",
   ]
 
@@ skipping 21 matching lines @@
     "//ios/chrome/browser/ui",
     "//ios/chrome/common",
     "//ios/web",
     "//net",
     "//services/service_manager/public/cpp",
     "//third_party/brotli",
     "//ui/base",
     "//url",
   ]
 }