Remove unnecessary reflection lookup in Animators.

Bug 17978210

When Properties are used with PropertyValuesHolders or
ObjectAnimators, the reflection lookup for getters and
setters is unnecessary.

Fixed problem in which static maps were being protected
by instance locks.

Fixed problem where we were repeatedly doing a
reflection lookup on methods that don't exist.

Change-Id: Ic0a1b62357f3aaaa4c900fef6087583ad0e964b6