Mirror object for objects.
@param {object} value The object reflected by this mirror
@param {boolean} transient indicate whether this object is transient with a
transient handle
@constructor
@extends ValueMirror
function ObjectMirror(value, type, transient) {
  type = type || MirrorType.OBJECT_TYPE;
  %_Call(ValueMirror, this, type, value, transient);
}