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This patch adds an API to gfx::Canvas to draw skottie directly on the
backing canvas. It also removes the bitmap rasterization of each
animation frame from the ui thread and offloads it to cc.

Bug: 890224
Change-Id: Ibf8d9b682428be26c12caa4cccaae9bd53bb255a
Component: gfx, canvas, skia vector animation
Reviewed-on: https://chromium-review.googlesource.com/c/1292527
Commit-Queue: Malay Keshav <malaykeshav@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601419}