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The first version of cros_tab_switching can only run by specifying the
argument --remote=DUT_IP. Enable running cros_tab_switching locally when
--remote is not specified so it can be used on test_that.

Bug: 852231
Change-Id: Ia92dc4913a039e7b4ae7488c1b8d0523451d4645
Reviewed-on: https://chromium-review.googlesource.com/1098872
Commit-Queue: Vovo Yang <vovoy@chromium.org>
Reviewed-by: Cheng-Yu Lee <cylee@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568739}