Allow S->T <: dynamic->T

lib/runtime/dart_runtime.js

Index: lib/runtime/dart_runtime.js
diff --git a/lib/runtime/dart_runtime.js b/lib/runtime/dart_runtime.js
index 39c042368dfdaf4d9e2d036efb4772e9b05dc7e6..d2463067aa598aea2e76ae6526e8c806caf0df6f 100644
--- a/lib/runtime/dart_runtime.js
+++ b/lib/runtime/dart_runtime.js
@@ -107,6 +107,11 @@ var dart;
   }
   dart.is = is;
 
+  function closureWrap(obj, type) {
+    // TODO(vsm): Remove this once we handle in the checker.
+    return obj;
+  }
+
   function isGroundType(type) {
     // TODO(vsm): Implement.
     throw new core.UnimplementedError();