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

Source/platform/weborigin/SecurityPolicy.cpp

Index: Source/platform/weborigin/SecurityPolicy.cpp
diff --git a/Source/platform/weborigin/SecurityPolicy.cpp b/Source/platform/weborigin/SecurityPolicy.cpp
index 631b1bbdcf78f064f97bda8f079a3e6772de8a4a..3778877d6119c3d2b992cc5993f9f2fe92730494 100644
--- a/Source/platform/weborigin/SecurityPolicy.cpp
+++ b/Source/platform/weborigin/SecurityPolicy.cpp
@@ -87,6 +87,17 @@ Referrer SecurityPolicy::generateReferrer(ReferrerPolicy referrerPolicy, const K
         // 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.
@@ -98,6 +109,7 @@ Referrer SecurityPolicy::generateReferrer(ReferrerPolicy referrerPolicy, const K
                 return Referrer(String(), referrerPolicy);
             return Referrer(shouldHideReferrer(url, referrer) ? String() : origin + "/", referrerPolicy);
         }
+        break;
     }
     case ReferrerPolicyNoReferrerWhenDowngrade:
         break;