Make Pip usage of FrameCallbackScheduler an actual class

Bug: 175330528
Test: Builds with new dynamic-animation library
Change-Id: I1632bd87a0f02940317a38a87b074d303f80b8c7
Merged-In: I1632bd87a0f02940317a38a87b074d303f80b8c7
(cherry picked from commit c6c603078b9a32f00b205b23919faea47343f54d)
1 file changed