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

net/url_request/url_fetcher.h

Index: net/url_request/url_fetcher.h
diff --git a/net/url_request/url_fetcher.h b/net/url_request/url_fetcher.h
index 691ee7d791ebc04f901fcab032ba1c22763840ff..0c16cf7543ec9da72da9fda342ea3bafe58f74ea 100644
--- a/net/url_request/url_fetcher.h
+++ b/net/url_request/url_fetcher.h
@@ -17,6 +17,10 @@
 
 class GURL;
 
+namespace url {
+class Origin;
+};
+
 namespace base {
 class FilePath;
 class SequencedTaskRunner;
@@ -210,6 +214,9 @@ class NET_EXPORT URLFetcher {
   virtual void SetFirstPartyForCookies(
       const GURL& first_party_for_cookies) = 0;
 
+  // Set the origin responsible for the request.
+  virtual void SetRequestorOrigin(const url::Origin& requestor_origin) = 0;
+
   // Set the key and data callback that is used when setting the user
   // data on any URLRequest objects this object creates.
   virtual void SetURLRequestUserData(