metrics: Document ownership of Power.* histograms.

metrics: Document ownership of Power.* histograms.

BUG=none

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=288900

[Daniel Erat, 2014-08-11 22:13:48]

Sameer and Doug, I'm listing you as owners or co-owners for a few of these. Let
me know if you have suggestions for other owners (or if you want to be listed
for more of them!).

(I don't know what being an owner actually entails;
https://goto.google.com/metrics-onwers doesn't say.)

[Mark P, 2014-08-11 22:18:47]

lgtm

Roughly, being an owner means you're responsible for making sure the logging
remains valid (i.e., the histogram records  what it says it does) / marking it
obsolete if it does not, and also being the place someone can go to for
questions.

--mark

[Daniel Erat, 2014-08-11 23:49:05]

The CQ bit was checked by derat@chromium.org

[commit-bot: I haz the power, 2014-08-11 23:51:43]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/derat@chromium.org/460843002/1

[commit-bot: I haz the power, 2014-08-12 00:42:28]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  ios_dbg_simulator on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_dbg_simulator...)

[commit-bot: I haz the power, 2014-08-12 03:27:37]

Change committed as 288900