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This patch implements a thread safe wrapper for the core skottie
animation object. We want to share the same animation resource file for
multiple SkiaVectorAnimation objects. This would allow us to do that.

This is also needed to implement the Phase 2 and Phase 3 of
rasterization where the rasterization would be handled by different
threads.

go/cros-skottie

Bug: 890512, 890224
Change-Id: I40371e58985ea4db5661f28a2ee8b31aab354a03
Component: Skia vector animation, skottie
Reviewed-on: https://chromium-review.googlesource.com/c/1253071Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Malay Keshav <malaykeshav@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596118}