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Power monitoring was added to the scheduler based on the incorrect
assumption that it would allow the system to use a lower timer
resolution on windows. This is not true because the timer resolution is
always high when on AC power while DelayBasedTimeSource is used for
vsync timing. On battery power the high resolution timer is disabled by
the power monitor irrespective of the presence of high resolution timer
tasks.

BUG=448939

Review URL: https://codereview.chromium.org/974083002

Cr-Commit-Position: refs/heads/master@{#319000}