Implement referred Token Bindings

net/url_request/url_request.h

Index: net/url_request/url_request.h
diff --git a/net/url_request/url_request.h b/net/url_request/url_request.h
index d3b0b7a7326b647d122ef7c8694bcc17a3595259..f287c6784cf67df970343d473dab5855c5ea7740 100644
--- a/net/url_request/url_request.h
+++ b/net/url_request/url_request.h
@@ -326,6 +326,13 @@ class NET_EXPORT URLRequest : NON_EXPORTED_BASE(public base::NonThreadSafe),
   ReferrerPolicy referrer_policy() const { return referrer_policy_; }
   void set_referrer_policy(ReferrerPolicy referrer_policy);
 
+  // If this request should include a referred Token Binding, this returns the
+  // hostname of the referrer that indicated this request should include a
+  // referred Token Binding. Otherwise, this returns the empty string.
+  const std::string& token_binding_referrer() const {
+    return token_binding_referrer_;
+  }
+
   // Sets the delegate of the request.  This is only to allow creating a request
   // before creating its delegate.  |delegate| must be non-NULL and the request
   // must not yet have a Delegate set.
@@ -794,6 +801,7 @@ class NET_EXPORT URLRequest : NON_EXPORTED_BASE(public base::NonThreadSafe),
   std::string method_;  // "GET", "POST", etc. Should be all uppercase.
   std::string referrer_;
   ReferrerPolicy referrer_policy_;
+  std::string token_binding_referrer_;
   FirstPartyURLPolicy first_party_url_policy_;
   HttpRequestHeaders extra_request_headers_;
   int load_flags_;  // Flags indicating the request type for the load;