First-Party Cookies: Wire it up as an experimental web platform feature

net/url_request/url_request_test_util.cc

Index: net/url_request/url_request_test_util.cc
diff --git a/net/url_request/url_request_test_util.cc b/net/url_request/url_request_test_util.cc
index 107da7858a33b3c9f073dacb177ea0dd34aca564..ebccd876de7cdb6761d2a11dcc536c38b9208b1a 100644
--- a/net/url_request/url_request_test_util.cc
+++ b/net/url_request/url_request_test_util.cc
@@ -322,6 +322,7 @@ TestNetworkDelegate::TestNetworkDelegate()
       has_load_timing_info_before_auth_(false),
       can_access_files_(true),
       can_throttle_requests_(true),
+      first_party_only_cookies_enabled_(false),
       cancel_request_with_policy_violating_referrer_(false),
       will_be_intercepted_on_next_error_(false) {
 }
@@ -603,6 +604,10 @@ bool TestNetworkDelegate::OnCanThrottleRequest(
   return can_throttle_requests_;
 }
 
+bool TestNetworkDelegate::OnFirstPartyOnlyCookieExperimentEnabled() const {
+  return first_party_only_cookies_enabled_;
+}
+
 bool TestNetworkDelegate::OnCancelURLRequestWithPolicyViolatingReferrerHeader(
     const URLRequest& request,
     const GURL& target_url,