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After crrev.com/c/1291350, OnKeyboardEnabledChanged is called with false
when Android IME is used.
This CL is a workaround for it. For longer term solution, please see
the linked bug.

Bug: 897655
Test: Gboard shows up in tablet mode.
Change-Id: I1047716212f1a4ec782b108fe02cdbef29aa2c6d
Reviewed-on: https://chromium-review.googlesource.com/c/1293106
Commit-Queue: Yuichiro Hanada <yhanada@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601851}