Change default output period of startEventLogging() to 5000ms

Bug: 775415
Change-Id: I44d028c36558df47c0dd33cc853d4e50938c49bc
Reviewed-on: https://chromium-review.googlesource.com/c/1370945
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Henrik Grunell <grunell@chromium.org>
Commit-Queue: Elad Alon <eladalon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615482}
7 files changed