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

Source/platform/weborigin/SecurityPolicy.cpp

 /*
  * Copyright (C) 2011 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 69 matching lines @@
     case ReferrerPolicyAlways:
         return Referrer(referrer, referrerPolicy);
     case ReferrerPolicyOrigin: {
         String origin = SecurityOrigin::createFromString(referrer)->toString();
         if (origin == "null")
             return Referrer(String(), referrerPolicy);
         // A security origin is not a canonical URL as it lacks a path. Add /
         // to turn it into a canonical URL we can use as referrer.
         return Referrer(origin + "/", referrerPolicy);
     }
+    case ReferrerPolicyOriginWhenCrossOrigin: {
+        RefPtr<SecurityOrigin> referrerOrigin = SecurityOrigin::createFromString(referrer);
+        RefPtr<SecurityOrigin> urlOrigin = SecurityOrigin::create(url);
+        if (!urlOrigin->isSameSchemeHostPort(referrerOrigin.get())) {
+            String origin = referrerOrigin->toString();
+            if (origin == "null")
+                return Referrer(String(), referrerPolicy);
+            return Referrer(origin + "/", referrerPolicy);
+        }
+        break;
+    }
     case ReferrerPolicyDefault: {
         // If the flag is enabled, and we're dealing with a cross-origin request, strip it.
         // Otherwise fallthrough to NoReferrerWhenDowngrade behavior.
         RefPtr<SecurityOrigin> referrerOrigin = SecurityOrigin::createFromString(referrer);
         RefPtr<SecurityOrigin> urlOrigin = SecurityOrigin::create(url);
         if (RuntimeEnabledFeatures::reducedReferrerGranularityEnabled() && !urlOrigin->isSameSchemeHostPort(referrerOrigin.get())) {
             String origin = referrerOrigin->toString();
             if (origin == "null")
                 return Referrer(String(), referrerPolicy);
             return Referrer(shouldHideReferrer(url, referrer) ? String() : origin + "/", referrerPolicy);
         }
+        break;
     }
     case ReferrerPolicyNoReferrerWhenDowngrade:
         break;
     }
 
     return Referrer(shouldHideReferrer(url, referrer) ? String() : referrer, referrerPolicy);
 }
 
 bool SecurityPolicy::isAccessWhiteListed(const SecurityOrigin* activeOrigin, const SecurityOrigin* targetOrigin)
 {
@@ skipping 52 matching lines @@
         map.remove(it);
 }
 
 void SecurityPolicy::resetOriginAccessWhitelists()
 {
     ASSERT(isMainThread());
     originAccessMap().clear();
 }
 
 } // namespace blink