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

Source/platform/weborigin/ReferrerPolicy.h

Index: Source/platform/weborigin/ReferrerPolicy.h
diff --git a/Source/platform/weborigin/ReferrerPolicy.h b/Source/platform/weborigin/ReferrerPolicy.h
index c143a078962d04310cf3b61a72ab250616f94c19..0f2bd29296fc4a49009b209269d616bb4a10f86f 100644
--- a/Source/platform/weborigin/ReferrerPolicy.h
+++ b/Source/platform/weborigin/ReferrerPolicy.h
@@ -35,13 +35,18 @@
 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,
 };
 
 }