Referrer Policy: Introduce "Origin When Cross-Origin". [1/3]

Source/platform/weborigin/ReferrerPolicy.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  */
 
 #ifndef ReferrerPolicy_h
 #define ReferrerPolicy_h
 
 namespace blink {
 
 enum ReferrerPolicy {
+    // https://w3c.github.io/webappsec/specs/referrer-policy/#referrer-policy-state-unsafe-url
     ReferrerPolicyAlways,
+    // The default policy, if no policy is explicitly set by the page.
     ReferrerPolicyDefault,
+    // https://w3c.github.io/webappsec/specs/referrer-policy/#referrer-policy-state-no-referrer-when-downgrade
     ReferrerPolicyNoReferrerWhenDowngrade,
+    // https://w3c.github.io/webappsec/specs/referrer-policy/#referrer-policy-state-no-referrer
     ReferrerPolicyNever,
-    // Same as ReferrerPolicyAlways, except that only the origin of the
-    // referring URL is send.
+    // https://w3c.github.io/webappsec/specs/referrer-policy/#referrer-policy-state-origin
     ReferrerPolicyOrigin,
+    // https://w3c.github.io/webappsec/specs/referrer-policy/#referrer-policy-state-origin-when-cross-origin
+    ReferrerPolicyOriginWhenCrossOrigin,
 };
 
 }
 
 #endif // ReferrerPolicy_h