Add a testing switch to override the query for other forms of browsing history

ios/chrome/browser/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("//build/config/features.gni")
 import("//ios/web/js_compile.gni")
 import("//third_party/protobuf/proto_library.gni")
 
 declare_args() {
   google_test_gaia_client_id = ""
@@ skipping 474 matching lines @@
     "ui/webui/about_ui.cc",
     "ui/webui/about_ui.h",
     "ui/webui/crashes_ui.cc",
     "ui/webui/crashes_ui.h",
     "ui/webui/flags_ui.cc",
     "ui/webui/flags_ui.h",
     "ui/webui/history/browsing_history_handler.cc",
     "ui/webui/history/browsing_history_handler.h",
     "ui/webui/history/favicon_source.cc",
     "ui/webui/history/favicon_source.h",
-    "ui/webui/history/history_ui.cc",
     "ui/webui/history/history_ui.h",
+    "ui/webui/history/history_ui.mm",
     "ui/webui/history/metrics_handler.cc",
     "ui/webui/history/metrics_handler.h",
     "ui/webui/net_export/net_export_ui.cc",
     "ui/webui/net_export/net_export_ui.h",
     "ui/webui/sync_internals/sync_internals_message_handler.cc",
     "ui/webui/sync_internals/sync_internals_message_handler.h",
     "ui/webui/sync_internals/sync_internals_ui.cc",
     "ui/webui/sync_internals/sync_internals_ui.h",
     "ui/webui/version_handler.cc",
     "ui/webui/version_handler.h",
@@ skipping 242 matching lines @@
     "//ios/public/provider/chrome/browser",
     "//ios/public/provider/chrome/browser:test_support",
     "//ios/web",
     "//sync",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/base",
     "//url",
   ]
 }