WIP: Teach "First-Party-Only" cookies about the requestor origin.

net/url_request/url_request.cc

Index: net/url_request/url_request.cc
diff --git a/net/url_request/url_request.cc b/net/url_request/url_request.cc
index c12f9d1ea26d83a49569b8d8945c07efbbd585c2..854985584d564937f9424f90364fb0a66b2d36b8 100644
--- a/net/url_request/url_request.cc
+++ b/net/url_request/url_request.cc
@@ -460,6 +460,11 @@ void URLRequest::set_first_party_url_policy(
   first_party_url_policy_ = first_party_url_policy;
 }
 
+void URLRequest::set_requestor_origin(const url::Origin& requestor_origin) {
+  DCHECK(!is_pending_);
+  requestor_origin_ = requestor_origin;
+}
+
 void URLRequest::set_method(const std::string& method) {
   DCHECK(!is_pending_);
   method_ = method;