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This patch adds a Chromium feature for CSSKeyframesMemoryReduction and
enables it in field trial testing config. This is preparation for a
Canary/Dev finch experiment.

Bug: 1141814
Change-Id: I03c1c9beca18bdf4b286704f60b6895f60835d12
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2518097Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824639}