title: android 3.0: JS scrollTop not working on chrome/webview
body: <p>I've written an app wrap by a webView, it work as expected on my milestone2 2.2<br/>
  but the scrolling functions is not working on 3.0's chrome(work in FF)<br/>
  neither by dom.scrollTop = XXX nor jquery $("#id").scrollTop(X)<br/>
  is it a bug? anyone can suggest how I fix it, thx!<br/>
  <br/>
  my tablet is Acer ICONIA TAB A500 with Android 3.0.1</p>