Apply Insets animation when hw acceleration unavailable

On certain midrange and lower-specced devices, apps could be running
without hardware acceleration. Insets animation relied on ThreadRenderer's
frame-by-frame callbacks to animate system bars / IME.
When hardware acceleration is not available, we should just animate it
without any frame sync for now.

Bug: 111084606
Bug: 149342281
Test: Manually tested on Go device
     1. Use app like Messages which don't have hw accelaration
     2. Tap on editor to verify IME appears.

Change-Id: Icf453f09f4236a5092cf3ff7be99f98ece073979