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Prior to the patch, the validity of the execution context was only
checked on entry to the method; however, the execution context can
be invalidated during the course of parsing keyframes or options.
The parsing of options is upstream of Animatable::animate and caught by
the existing check, but invalidation during keyframe parsing could fall
through triggering a crash.

Bug: 1161739
Change-Id: Ic0fc927d1d6ce902592bf92261fd4c506e96afac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2636213
Commit-Queue: Kevin Ellis <kevers@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844622}