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This is needed for Page Controller or other UI-Automator based tests that can't
use the CommandLineFlags mechanism.

Bug: 1009529
Change-Id: If0364f37c2fe3f49e2111c2ed505fd4ed9392e6c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1860144
Commit-Queue: Andrew Luo <aluo@chromium.org>
Reviewed-by: Sky Malice <skym@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710197}