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

ios/chrome/ios_chrome.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 618 matching lines @@
         'browser/ui/webui/crashes_ui.cc',
         'browser/ui/webui/crashes_ui.h',
         'browser/ui/webui/flags_ui.cc',
         'browser/ui/webui/flags_ui.h',
         'browser/ui/webui/gcm/gcm_internals_ui.cc',
         'browser/ui/webui/gcm/gcm_internals_ui.h',
         'browser/ui/webui/history/browsing_history_handler.cc',
         'browser/ui/webui/history/browsing_history_handler.h',
         'browser/ui/webui/history/favicon_source.cc',
         'browser/ui/webui/history/favicon_source.h',
-        'browser/ui/webui/history/history_ui.cc',
         'browser/ui/webui/history/history_ui.h',
+        'browser/ui/webui/history/history_ui.mm',
         'browser/ui/webui/history/metrics_handler.cc',
         'browser/ui/webui/history/metrics_handler.h',
         'browser/ui/webui/net_export/net_export_ui.cc',
         'browser/ui/webui/net_export/net_export_ui.h',
         'browser/ui/webui/sync_internals/sync_internals_message_handler.cc',
         'browser/ui/webui/sync_internals/sync_internals_message_handler.h',
         'browser/ui/webui/sync_internals/sync_internals_ui.cc',
         'browser/ui/webui/sync_internals/sync_internals_ui.h',
         'browser/ui/webui/version_handler.cc',
         'browser/ui/webui/version_handler.h',
@@ skipping 197 matching lines @@
             '../../components/components.gyp:omnibox_browser',
             '../../components/components.gyp:rlz',
             '../../components/components.gyp:search_engines',
             '../../rlz/rlz.gyp:rlz_lib',
           ],
         },
       ],
     }],
   ],
 }