title: Adding Progress Bar during RPC
body: <p>I want to add a progress bar during a gwt-rpc call which shows the percentage of the task completed.Anyone who can help me with a piece of code for the same?<br>
  Also I load videos into my client side from the war directory and they take a while.Therefore if I try to play them  sometimes the browser goes unresponsive(probably because entire part hasnt loaded) .Is there a way to determine (and hence show the user) when the videos are completely loaded?</p>