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

net/base/network_delegate.h

Index: net/base/network_delegate.h
diff --git a/net/base/network_delegate.h b/net/base/network_delegate.h
index 5af2ac140efa5b6f5e0d4fe897d413f7fb31bdde..9ea82028b11fc8dd6025577c9b84406f81d0d141 100644
--- a/net/base/network_delegate.h
+++ b/net/base/network_delegate.h
@@ -104,6 +104,10 @@ class NET_EXPORT NetworkDelegate : public base::NonThreadSafe {
   bool CanEnablePrivacyMode(const GURL& url,
                             const GURL& first_party_for_cookies) const;
 
+  // TODO(mkwst): Remove this once we decide whether or not we wish to ship
+  // first-party cookies. https://crbug.com/459154
+  bool FirstPartyOnlyCookieExperimentEnabled() const;
+
   bool CancelURLRequestWithPolicyViolatingReferrerHeader(
       const URLRequest& request,
       const GURL& target_url,
@@ -266,6 +270,13 @@ class NET_EXPORT NetworkDelegate : public base::NonThreadSafe {
       const GURL& url,
       const GURL& first_party_for_cookies) const = 0;
 
+  // Returns true if the embedder has enabled the "first-party" cookie
+  // experiment, and false otherwise.
+  //
+  // TODO(mkwst): Remove this once we decide whether or not we wish to ship
+  // first-party cookies. https://crbug.com/459154
+  virtual bool OnFirstPartyOnlyCookieExperimentEnabled() const = 0;
+
   // Called when the |referrer_url| for requesting |target_url| during handling
   // of the |request| is does not comply with the referrer policy (e.g. a
   // secure referrer for an insecure initial target).