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As a starting point for test coverage of multi-display overview and
split view, the most important existing test suites involving split view
mode shall be endowed with a parameter that determines whether to enable
the feature flag, to test that old split view functionality still works.

Bug: 970013
Change-Id: I971382e68cac7e423442db401e078b85c85f1953
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1825730
Commit-Queue: Avery Musbach <amusbach@chromium.org>
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700453}