Add suborigin logic to url::Origin

url/url_constants.h

Index: url/url_constants.h
diff --git a/url/url_constants.h b/url/url_constants.h
index 3a423d2634201ba18aa1578db9f8500c2f3ff881..c11058983eaaadb8aae2d75be6deeca3d32dc7c4 100644
--- a/url/url_constants.h
+++ b/url/url_constants.h
@@ -30,6 +30,11 @@ URL_EXPORT extern const char kMailToScheme[];
 URL_EXPORT extern const char kWsScheme[];
 URL_EXPORT extern const char kWssScheme[];
 
+// Special HTTP and HTTPS schemes for serialization of suborigins. See
+// https://w3c.github.io/webappsec-suborigins/.
+URL_EXPORT extern const char kHttpSuboriginScheme[];
+URL_EXPORT extern const char kHttpsSuboriginScheme[];
+
 // Used to separate a standard scheme and the hostname: "://".
 URL_EXPORT extern const char kStandardSchemeSeparator[];