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As the impact of the feature is unclear, we want to add a kill switch of
the feature through Finch experiment, so that even when the feature
lands in stable it can be disabled quickly.

Android side CL: http://ag/9778557

TEST=Add --force-fieldtrials="ArcMinimizeOnBackButton/Enabled/" or
"ArcMinimizeOnBackButton/Disabled/" to /etc/chrome_dev.conf to see
TEST=ArcPropertyBridgeTest
the setting is properly overridden
BUG=972708,b:144896228

Change-Id: If82db66508f623a7a6f7846d8c7d702fa4bc4e95
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1930367Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Stefan Kuhne <skuhne@chromium.org>
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720765}