Add TypeMirror.isSubtypeOf, TypeMirror.isAssignableTo, ClassMirror.isSubclassOf

runtime/lib/mirrors.cc

Index: runtime/lib/mirrors.cc
diff --git a/runtime/lib/mirrors.cc b/runtime/lib/mirrors.cc
index 3b7391caf42238dba40a43e93faefaf52a13fafe..a8d51ca84a38f5c876edd9c18797e27a59ed78d7 100644
--- a/runtime/lib/mirrors.cc
+++ b/runtime/lib/mirrors.cc
@@ -2068,4 +2068,17 @@ DEFINE_NATIVE_ENTRY(VariableMirror_type, 2) {
   return InstantiateType(type, instantiator);
 }
 
+DEFINE_NATIVE_ENTRY(TypeMirror_subtypeTest, 2) {
+  GET_NON_NULL_NATIVE_ARGUMENT(AbstractType, a, arguments->NativeArgAt(0));
+  GET_NON_NULL_NATIVE_ARGUMENT(AbstractType, b, arguments->NativeArgAt(1));
+  return Bool::Get(a.IsSubtypeOf(b, NULL)).raw();
+}
+
+DEFINE_NATIVE_ENTRY(TypeMirror_moreSpecificTest, 2) {
+  GET_NON_NULL_NATIVE_ARGUMENT(AbstractType, a, arguments->NativeArgAt(0));
+  GET_NON_NULL_NATIVE_ARGUMENT(AbstractType, b, arguments->NativeArgAt(1));
+  return Bool::Get(a.IsMoreSpecificThan(b, NULL)).raw();
+}
+
+
 }  // namespace dart