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Currently, we show gesture navigation screen in tablet mode only, though
for touch centric devices, the screen should be shown even if the device
is in clamshell mode.

To achieve this, add support for a command line switch
"oobe-force-tablet-first-run" that would force tablet mode flow for the
first user run, even if the device is in clamshell during setup.

The flag is expected to be passed in by login manager during chrome setup.

BUG=976949

Change-Id: I754eb09c4b3ddbb85af2148f5f062e971e6a1e21
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2092696Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748279}