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Leaving tablet mode on lid state changes is a workaround for the lid
being erroneously detected as fully open at small lid angles, which
could cause the device to be detected as in tablet mode while opening
the lid. This workaround should not override tablet mode state if
tablet mode switch is on - this is a reliable indicator that the
device actually is in tablet mode. Overriding this state could be
problematic on detachable devices if the keyboard is detached while
the lid is closed. In that case, the device could report lid as open
after entering the tablet mode, and subsequently, and unexpectedly
leave the tablet mode.

BUG=b/79327284

Change-Id: I31f2d31182122fc8a6a73e185360858e035118fe
Reviewed-on: https://chromium-review.googlesource.com/1054370Reviewed-by: Jonathan Ross <jonross@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
Commit-Queue: Toni Barzic <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557650}