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Adds the skottie animation class that is a wrapper around the Skia's
implementation of lottie player. The class manages its own timeline with
the help of a timer object.

This is the phase 1 implementation of native skottie which rasterizes
the animation on the UI thread. Subsequent changes will move this
rasterization to worker threads(phase 2) and then to GPU (phase 3).

Adds unittests as well.

Design Doc: go/cros-skottie

Bug: 867147
Change-Id: I2501710a38874f247ab3ab56a743675e3d07edfb
Component: gfx, skottie, vector animation
Reviewed-on: https://chromium-review.googlesource.com/1189056
Commit-Queue: Malay Keshav <malaykeshav@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594981}