Merge change 27411 into eclair

* changes:
  Cache inflated view to avoid inflation of layouts in preferences If layout id is specified for a Preference object, convertView is set to null in its adapter which results in inflation of Preference view in getView each time the Preference object is laid out on the screen. Just use an instance variable to cache the inflated view nulling it whenever the layout changes and use it in initing the convertView in getView.