Avoid continuously polling devices due to certain udev event patterns.

BUG=chrome-os-partner:12868
TEST=Run suspend_stress_test and verify from syslog that cromo stops
the device polling shortly after starting it.

Reviewed-on: https://gerrit.chromium.org/gerrit/34402
Tested-by: Ben Chan <benchan@chromium.org>
Reviewed-by: Darin Petkov <petkov@chromium.org>
Commit-Ready: Ben Chan <benchan@chromium.org>
(cherry picked from commit b101a6aff8b9e5d023d73540674e191580ac6115)

Change-Id: I7ef8ddfc2a0e62d83641953239e68e4c5e0a1f6c
Reviewed-on: https://gerrit.chromium.org/gerrit/38983
Reviewed-by: Ben Chan <benchan@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
2 files changed