/**
  * Retrieve the output arguments from an asynchronously invoked action. This may only be called
  * from the callback set in the {@link #beginTime} method.
  *
  * @param aAsyncHandle argument passed to the delegate set in the {@link #beginTime} method.
  * @return the result of the previously invoked action.
  */
 public Time endTime(long aAsyncHandle) {
   ProxyError errObj = Invocation.error(aAsyncHandle);
   if (errObj != null) {
     throw errObj;
   }
   int index = 0;
   long trackCount = Invocation.getOutputUint(aAsyncHandle, index++);
   long duration = Invocation.getOutputUint(aAsyncHandle, index++);
   long seconds = Invocation.getOutputUint(aAsyncHandle, index++);
   return new Time(trackCount, duration, seconds);
 }