SF: improve RenderThread jank classificaion

Mark UI frames that didn't make it to their expected presentation
due to RenderThread animations as dropped.

Screenshot from Perfetto: https://screenshot.googleplex.com/3pQuNaDYAhHLYu7

Bug: 210605870
Test: manual
Change-Id: Ibc91bcaac2f9296ec0bddd5deebb4289c5b5bf7e
Merged-In: Ibc91bcaac2f9296ec0bddd5deebb4289c5b5bf7e