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Auto rotation depends on the tablet physical state of the device,
not the UI state. Therefore AccelerometerFileReader should keep
reading accelerometer data as long as the device is physically
a tablet (detached or flipped).

BUG=1056862
TEST=Manually on hatch.

Change-Id: I96f6c8f1430fa2d50b20aaa97bd25e072bce098f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2079618Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745284}