Certain use patterns could trigger a deallocation of the system memory
storage as it was being initialized. Fix this by resetting the idle
counter before we enter into the internal update which would trigger
the deallocation check.

BUG=chromium:682020

Change-Id: Ic3dac78ffa778cbaf103820a23eea009ce439d5c
Reviewed-on: https://chromium-review.googlesource.com/430304Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>