Skottie perf metric improvements

Add 2 lottie files given by wearos.
Measure startup time.
Measure total time for 7 seconds starting from second frame.

Test: Ran tests on wearos and android.
Change-Id: I87ddcd116df0cd39df42636cca518a91c3be0329
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/300044
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Stan Iliev <stani@google.com>
7 files changed