Fix starting of animations

We need to manually process the first animation frame as
mStartTime of ValueAnimator would only be set when processing
the next animation frame.

Test: go/wm-smoke
Test: Add some additional tracing about current playing time and
observe no delay.
Bug: 64674361
Change-Id: Iad753bfb7b86cfd57f265b5084a3d24f967dcaf3