Add experimental code behind a flag for Content Size Policy

content/browser/loader/resource_request_info_impl.cc

Index: content/browser/loader/resource_request_info_impl.cc
diff --git a/content/browser/loader/resource_request_info_impl.cc b/content/browser/loader/resource_request_info_impl.cc
index a0e508bc6695b579d120e17b450f2c64ef1e2b11..bdd29027393b32b165688c2f0a8677bb828ef83c 100644
--- a/content/browser/loader/resource_request_info_impl.cc
+++ b/content/browser/loader/resource_request_info_impl.cc
@@ -325,6 +325,10 @@ GlobalRoutingID ResourceRequestInfoImpl::GetGlobalRoutingID() const {
   return GlobalRoutingID(child_id_, route_id_);
 }
 
+GlobalFrameRoutingId ResourceRequestInfoImpl::GetGlobalFrameRoutingId() const {
+  return GlobalFrameRoutingId(child_id_, render_frame_id_);
+}
+
 void ResourceRequestInfoImpl::UpdateForTransfer(
     int child_id,
     int route_id,