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

net/url_request/url_fetcher_core.h

Index: net/url_request/url_fetcher_core.h
diff --git a/net/url_request/url_fetcher_core.h b/net/url_request/url_fetcher_core.h
index b20720e3caf7782a21a772c5771bd9dc728bb105..4a683ab31a15b06efb855139fcfff43d3420e1a4 100644
--- a/net/url_request/url_fetcher_core.h
+++ b/net/url_request/url_fetcher_core.h
@@ -23,6 +23,7 @@
 #include "net/url_request/url_request_context_getter_observer.h"
 #include "net/url_request/url_request_status.h"
 #include "url/gurl.h"
+#include "url/origin.h"
 
 namespace base {
 class SingleThreadTaskRunner;
@@ -88,6 +89,7 @@ class URLFetcherCore : public base::RefCountedThreadSafe<URLFetcherCore>,
   // Set the URL that should be consulted for the third-party cookie
   // blocking policy.
   void SetFirstPartyForCookies(const GURL& first_party_for_cookies);
+  void SetRequestorOrigin(const url::Origin& requestor_origin);
   // Set the key and data callback that is used when setting the user
   // data on any URLRequest objects this object creates.
   void SetURLRequestUserData(
@@ -238,6 +240,7 @@ class URLFetcherCore : public base::RefCountedThreadSafe<URLFetcherCore>,
   scoped_refptr<URLRequestContextGetter> request_context_getter_;
                                      // Cookie/cache info for the request
   GURL first_party_for_cookies_;     // The first party URL for the request
+  url::Origin requestor_origin_;     // The origin responsible for the request.
   // The user data to add to each newly-created URLRequest.
   const void* url_request_data_key_;
   URLFetcher::CreateDataCallback url_request_create_data_callback_;