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Animated images may change before invalidation. For example, an
image with SVG animation gets ImageChanged notification
periodically but a paint triggered by some other change may not
just follow an invalidation of the animated image.

Bug: 819683
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: I5acb3eedc0ac714a600ac6df752dc22245bf3d1d
Reviewed-on: https://chromium-review.googlesource.com/956303
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542211}