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Internal keyboard and touchpad events are previously locked when entering
tablet mode and unlocked when leaving. Now, when we attach a mouse, it
will exit tablet mode, but the keyboard should not stay locked as the
keyboard will be facing downwards in the case of flip chromebook. The
lock should instead be controlled by the hinges regardless if change in
hinge causes tablet mode to change.

Also rename EnterTabletMode to AttemptEnterTabletMode as it does not
always enter.

Test: ash_unittests TabletModeControllerTest.LeaveTabletModeWhenExternalMouseConnected
Bug: 870757
Change-Id: I38a537871aa6a1e7cd94311308d421af3dfc2ad1
Reviewed-on: https://chromium-review.googlesource.com/1162512
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580657}