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

chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc

Index: chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
diff --git a/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc b/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
index b28332ea3809ee058b9b810f1b6d44be397b5319..3ce8010f3b06e30354be19b484376fb7a7f1c4fb 100644
--- a/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
+++ b/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
@@ -27,6 +27,7 @@
 #include "chrome/browser/profiles/profile_io_data.h"
 #include "chrome/browser/renderer_host/data_reduction_proxy_resource_throttle_android.h"
 #include "chrome/browser/renderer_host/safe_browsing_resource_throttle.h"
+#include "chrome/browser/renderer_host/thread_hop_resource_throttle.h"
 #include "chrome/browser/safe_browsing/safe_browsing_service.h"
 #include "chrome/browser/signin/chrome_signin_helper.h"
 #include "chrome/browser/tab_contents/tab_util.h"
@@ -538,6 +539,9 @@ void ChromeResourceDispatcherHostDelegate::AppendStandardResourceThrottles(
   if (info->GetVisibilityState() == blink::WebPageVisibilityStatePrerender) {
     throttles->push_back(new prerender::PrerenderResourceThrottle(request));
   }
+
+  if (ThreadHopResourceThrottle::IsEnabled())
+    throttles->push_back(new ThreadHopResourceThrottle);
 }
 
 bool ChromeResourceDispatcherHostDelegate::ShouldForceDownloadResource(