Found and solved a problem which caused only one ancestor's constructor to be called. Added "super_init" method generation to InitializerVisitor. Worked on KotlinJsLib to solve this issue. This solution should evolve in the future.

js/src/com/google/dart/compiler/util/AstUtil.java

@@ -262,4 +262,10 @@ public class AstUtil {
         result.setQualifier(new JsThisRef());
         return result;
     }
+
+    public static JsBlock newBlock(List<JsStatement> statements) {
+        JsBlock result = new JsBlock();
+        result.setStatements(statements);
+        return result;
+    }
 }