Add a field trial to delay all resource requests by thread hops.

chrome/chrome_browser.gypi

 # Copyright 2012 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': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 713 matching lines @@
       'browser/renderer_context_menu/context_menu_content_type_panel.cc',
       'browser/renderer_context_menu/context_menu_content_type_panel.h',
       'browser/renderer_host/chrome_render_message_filter.cc',
       'browser/renderer_host/chrome_render_message_filter.h',
       'browser/renderer_host/chrome_render_widget_host_view_mac_delegate.h',
       'browser/renderer_host/chrome_render_widget_host_view_mac_delegate.mm',
       'browser/renderer_host/chrome_render_widget_host_view_mac_history_swiper.h',
       'browser/renderer_host/chrome_render_widget_host_view_mac_history_swiper.mm',
       'browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc',
       'browser/renderer_host/chrome_resource_dispatcher_host_delegate.h',
+      'browser/renderer_host/thread_hop_resource_throttle.cc',
+      'browser/renderer_host/thread_hop_resource_throttle.h',
       'browser/renderer_preferences_util.cc',
       'browser/renderer_preferences_util.h',
       'browser/resources_util.cc',
       'browser/resources_util.h',
       'browser/safe_browsing/safe_browsing_tab_observer.cc',
       'browser/safe_browsing/safe_browsing_tab_observer.h',
       'browser/safe_browsing/srt_fetcher_win.cc',
       'browser/safe_browsing/srt_fetcher_win.h',
       'browser/safe_browsing/srt_field_trial_win.cc',
       'browser/safe_browsing/srt_field_trial_win.h',
@@ skipping 3357 matching lines @@
             '../components/components.gyp:omnibox_browser',
             '../components/components.gyp:rlz',
             '../components/components.gyp:search_engines',
             '../rlz/rlz.gyp:rlz_lib',
           ],
         },
       ],
     }],
   ],
 }