Fix Gingerbread alpha animation problems.

TIMOB-6659: Add workaround in Animation library for anomaly
occurring when alpha animation is the only animation being
done.

TIMOB-5379: Allow animation library to handle all alpha
changes.
Merge pull request #4694 from billdawson/timob-5379

Andorid: TIMOB-6659 & TIMOB-5379, Gingerbread Alpha animation anomalies.