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For idle times < 1000us, we sent notifications with 0ms. This patch
adds a check for idle_time_in_ms to be non-zero and re-enables the
feature by default.

R=jochen@chromium.org
BUG=414815

Review URL: https://codereview.chromium.org/583833002

Cr-Commit-Position: refs/heads/master@{#295680}