SameSite: Implement 'Strict'/'Lax' attribute parsing.

net/cookies/cookie_store.h

Index: net/cookies/cookie_store.h
diff --git a/net/cookies/cookie_store.h b/net/cookies/cookie_store.h
index c44139b0b87257001f2413ad89632ff8e31a8784..6fabe922d207de6c7483ef80b635592d19aa2b58 100644
--- a/net/cookies/cookie_store.h
+++ b/net/cookies/cookie_store.h
@@ -91,7 +91,7 @@ class NET_EXPORT CookieStore {
       base::Time last_access_time,
       bool secure,
       bool http_only,
-      bool same_site,
+      CookieSameSite same_site,
       bool enforce_strict_secure,
       CookiePriority priority,
       const SetCookiesCallback& callback) = 0;