cc: Remove scheduler power monitoring.

cc: Remove scheduler power monitoring.

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
Committed: https://crrev.com/969a20562c23ef36b21462202db2b526c60e3f9f
Cr-Commit-Position: refs/heads/master@{#319000}

[sunnyps, 2015-03-03 23:27:22]

sunnyps@chromium.org changed reviewers:
+ brianderson@chromium.org

[sunnyps, 2015-03-03 23:27:23]

I've asked cpu@ to confirm what the CL description says.

I'll post an update here once he replies and you can review it then.

[sunnyps, 2015-03-03 23:59:45]

PTAL.

cpu@ confirmed that:

1. While a page is loading we use a timer to simulate vsync by posting ~16ms
delayed tasks. This means that because the delay < 32 ms  the high res timer is
in use.
2. When we switch to battery power the high res timer is disabled even if there
are high res timer tasks.

[brianderson, 2015-03-04 01:18:56]

lgtm

[sunnyps, 2015-03-04 01:20:48]

The CQ bit was checked by sunnyps@chromium.org

[commit-bot: I haz the power, 2015-03-04 01:21:57]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/974083002/1

[commit-bot: I haz the power, 2015-03-04 02:15:49]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-04 02:16:16]

Patchset 1 (id:??) landed as
https://crrev.com/969a20562c23ef36b21462202db2b526c60e3f9f
Cr-Commit-Position: refs/heads/master@{#319000}