[Navigation Experiment] Add WKBasedNavigationManagerImpl.

ios/web/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("//ios/web/js_compile.gni")
 import("//testing/test.gni")
 import("//tools/grit/grit_rule.gni")
 
 group("all_tests") {
@@ skipping 49 matching lines @@
     "navigation/legacy_navigation_manager_impl.h",
     "navigation/legacy_navigation_manager_impl.mm",
     "navigation/navigation_item_impl.h",
     "navigation/navigation_item_impl.mm",
     "navigation/navigation_item_impl_list.h",
     "navigation/navigation_item_impl_list.mm",
     "navigation/navigation_item_storage_builder.h",
     "navigation/navigation_item_storage_builder.mm",
     "navigation/navigation_manager_delegate.h",
     "navigation/navigation_manager_impl.h",
+    "navigation/navigation_manager_impl.mm",
     "navigation/navigation_manager_util.h",
     "navigation/navigation_manager_util.mm",
     "navigation/nscoder_util.h",
     "navigation/nscoder_util.mm",
     "navigation/serializable_user_data_manager_impl.h",
     "navigation/serializable_user_data_manager_impl.mm",
     "navigation/session_storage_builder.h",
     "navigation/session_storage_builder.mm",
     "navigation/time_smoother.cc",
     "navigation/time_smoother.h",
+    "navigation/web_view_navigation_proxy.h",
+    "navigation/web_view_navigation_proxy_impl.h",
+    "navigation/web_view_navigation_proxy_impl.mm",
+    "navigation/wk_based_navigation_manager_impl.h",
+    "navigation/wk_based_navigation_manager_impl.mm",
     "net/cert_host_pair.cc",
     "net/cert_host_pair.h",
     "net/cert_policy.cc",
     "net/certificate_policy_cache.cc",
     "net/cookie_notification_bridge.h",
     "net/cookie_notification_bridge.mm",
     "net/crw_cert_verification_controller.h",
     "net/crw_cert_verification_controller.mm",
     "net/crw_request_tracker_delegate.h",
     "net/crw_ssl_status_updater.h",
@@ skipping 784 matching lines @@
     "ios_web_resources.pak",
   ]
   grit_flags = [
     "-E",
     "root_gen_dir=" + rebase_path(root_gen_dir, root_build_dir),
   ]
   deps = [
     "//mojo/public/js:bindings",
   ]
 }