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

chrome/browser/net/chrome_network_delegate.h

Index: chrome/browser/net/chrome_network_delegate.h
diff --git a/chrome/browser/net/chrome_network_delegate.h b/chrome/browser/net/chrome_network_delegate.h
index 4635e57422fbc183b935b81887dafb9e515e2fed..bd195c96867bfe79ec4e7e51d3c432bf90d4d54f 100644
--- a/chrome/browser/net/chrome_network_delegate.h
+++ b/chrome/browser/net/chrome_network_delegate.h
@@ -148,7 +148,7 @@ class ChromeNetworkDelegate : public net::NetworkDelegateImpl {
   static void AllowAccessToAllFiles();
 
  private:
-  friend class ChromeNetworkDelegateTest;
+  friend class ChromeNetworkDelegateThrottlingTest;
 
   // NetworkDelegate implementation.
   int OnBeforeURLRequest(net::URLRequest* request,
@@ -188,6 +188,7 @@ class ChromeNetworkDelegate : public net::NetworkDelegateImpl {
   bool OnCanEnablePrivacyMode(
       const GURL& url,
       const GURL& first_party_for_cookies) const override;
+  bool OnFirstPartyOnlyCookieExperimentEnabled() const override;
   bool OnCancelURLRequestWithPolicyViolatingReferrerHeader(
       const net::URLRequest& request,
       const GURL& target_url,
@@ -230,6 +231,7 @@ class ChromeNetworkDelegate : public net::NetworkDelegateImpl {
   static bool g_never_throttle_requests_;
 
   scoped_ptr<ClientHints> client_hints_;
+  bool experimental_web_platform_features_enabled_;
 
   bool first_request_;