Reland "implement working CorrectnessActivity to generate lottie keyframe PNGs"

This is a reland of 7f5e99465db31d16e8ca37b9a87dff876c8bf7d0

Original change's description:
> implement working CorrectnessActivity to generate lottie keyframe PNGs
> 
> 
> make correctness activity loop through all available lotties
> 
> 
> implement tests for lottie correctness through Android Activity
> 
> Change-Id: I8b5d1dfc0641e3227f23a4d4560faa756b245ede
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/305216
> Reviewed-by: Stan Iliev <stani@google.com>
> Commit-Queue: Jorge Betancourt <jmbetancourt@google.com>

Change-Id: I59f4a02acfbddd2c8bbee0adcda1d737c9566c0b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/305601
Reviewed-by: Stan Iliev <stani@google.com>
Commit-Queue: Jorge Betancourt <jmbetancourt@google.com>
4 files changed