Add UseCounters for init*Event methods that aren't already measured

Add UseCounters for init*Event methods that aren't already measured

These methods systematically have "[Default=Undefined] optional"
arguments where the spec (if any) has non-optional arguments. Usage of
most of these is likely low, so just measure them all to see where the
change can be made without further investigation.

Also change a few argument names that were not per their specs.

BUG=460722
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=198345

[philipj_slow, 2015-07-06 21:24:46]

The CQ bit was checked by philipj@opera.com to run a CQ dry run

[philipj_slow, 2015-07-06 21:25:10]

philipj@opera.com changed reviewers:
+ rbyers@chromium.org

[philipj_slow, 2015-07-06 21:25:11]

PTAL and CQ?

[commit-bot: I haz the power, 2015-07-06 21:25:24]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1215893006/1

[Rick Byers, 2015-07-06 21:32:52]

lgtm

[Rick Byers, 2015-07-06 21:34:32]

The CQ bit was unchecked by rbyers@chromium.org

[Rick Byers, 2015-07-06 21:34:39]

The CQ bit was checked by rbyers@chromium.org

[commit-bot: I haz the power, 2015-07-06 21:35:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1215893006/1

[commit-bot: I haz the power, 2015-07-06 22:37:13]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=198345