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This commit adds comments of pausing and resuming the reading with
chromeos::sensors::SensorDevice::SetFrequency.

BUG=chromium:1006141
TEST=none

Change-Id: Iffbafdae7f8091d121a0beed3cca752d59236194
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2470286Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Reviewed-by: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
Commit-Queue: Cheng-Hao Yang <chenghaoyang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817336}