Provide the equivalent of GURL::DomainIs for url::Origin.

url/origin.cc

Index: url/origin.cc
diff --git a/url/origin.cc b/url/origin.cc
index 97e24f208d5b2098df01078615a7791503d30fbf..a14c8918d35bfbf4430d0d5c5d7ebee577639f95 100644
--- a/url/origin.cc
+++ b/url/origin.cc
@@ -72,6 +72,10 @@ bool Origin::IsSameOriginWith(const Origin& other) const {
   return tuple_.Equals(other.tuple_);
 }
 
+bool Origin::DomainIs(base::StringPiece lower_ascii_domain) const {
+  return !unique_ && url::DomainIs(tuple_.host(), lower_ascii_domain);
+}
+
 bool Origin::operator<(const Origin& other) const {
   return tuple_ < other.tuple_;
 }