Jeff Brown ff532540f1 Improve the screen dim duration calculation.
Take into account whether the screen off timeout is very short.
If so, we use a shorter dim timeout.  Don't allow the dim
time to be more than 20% of the total screen on time so that
the screen remains bright at least 80% of the time even when
the timeout is short.

Bug: 7273646
Change-Id: Iccea764b90f0d8b1df7009d26160c6bcf6eabe5b
2012-10-02 21:18:04 -07:00
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