Updated ViewPropertyAnimator to call View

methods

Modified ViewPropertyAnimator to call directly
into View setters instead of RenderNode APIs to match
implementation of FloatProperty objects on View. This
makes the animation APIs consistent with one another
and always call through the proper code paths to
give View implementations an opportunity to handle
alpha changes themselves.

Bug: 140961174
Test: Added CTS tests for ViewPropertyAnimator
Change-Id: I1c0023af50be47786296b46510034eb798658c20