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IsolatedCodeCache feature has been on finch trial since 71 and the
results are as expected. No measurable regressions on the top-level
loading metrics and an expected regression of ~7-10% on the time spent
compiling Javascript. The regression is expected because we do not share
the compiled code across different origins.

Bug: chromium:812168
Change-Id: Ib0aec9def0be83ae59298adc8516979b7587ae27
Reviewed-on: https://chromium-review.googlesource.com/c/1337625
Commit-Queue: Mythri Alle <mythria@chromium.org>
Reviewed-by: Maks Orlovich <morlovich@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608784}