Give a tablet a chance.

500 msec is apparently not enough time to push the pixels around on
a Volantis (or Manta, or occasionally Deb). Increasing the timeout
eliminates turning the screen on before the surface is completely
drawn.

Optimizing the drawing path so that we can return the timeout to
500ms has been filed as b/17496306.

Fixes bug 16849724.

Change-Id: Ic0fca68bc41caa67dba973b5c40915756dc4730f