Created a test page for window.history.[push/replace]State() tests.

ios/testing/BUILD.gn

 # Copyright 2015 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("//ios/build/config.gni")
 import("//testing/test.gni")
 
 group("all_tests") {
   testonly = true
   deps = [
@@ skipping 64 matching lines @@
     "data/http_server_files/history.html",
     "data/http_server_files/history.js",
     "data/http_server_files/history_go.html",
     "data/http_server_files/history_go.js",
     "data/http_server_files/memory_usage.html",
     "data/http_server_files/multi_field_form.html",
     "data/http_server_files/pony.html",
     "data/http_server_files/redirect_refresh.html",
     "data/http_server_files/request_desktop_test_page.html",
     "data/http_server_files/single_page_wide.pdf",
+    "data/http_server_files/state_operations.html",
+    "data/http_server_files/state_operations.js",
     "data/http_server_files/testpage.pdf",
     "data/http_server_files/two_pages.pdf",
     "data/http_server_files/window_close.html",
     "data/http_server_files/window_location.html",
     "data/http_server_files/window_location.js",
     "data/http_server_files/window_open.html",
     "data/http_server_files/window_proxy.html",
   ]
   outputs = [
     "{{bundle_resources_dir}}/" +
         "{{source_root_relative_dir}}/{{source_file_part}}",
   ]
 }