Avoid reflection with ObjectAnimator

Use explicit FloatProperty proxies for routing ObjectAnimator updates.
This prevents issues with Proguard-related shrinking/optimization for
custom class types.

Test: atest SystemUITests + manual validation of error logs
Bug: 203472868
Change-Id: Ie0889101f1063a929d2052756b1f4008f2b84a92
3 files changed