Service Worker: Reset "idle" timer upon completion of an event.

Service Worker: Reset "idle" timer upon completion of an event.

Otherwise the worker could get stopped if the timer happens to expire between
events while it's in a flurry of events.

BUG=462096
Committed: https://crrev.com/17f72bbde1bef95b10c2c56ced278a33dd74c05a
Cr-Commit-Position: refs/heads/master@{#322341}

[falken, 2015-03-26 04:50:04]

falken@chromium.org changed reviewers:
+ kinuko@chromium.org

[falken, 2015-03-26 04:50:04]

PTL

[kinuko, 2015-03-26 05:01:52]

lgtm, thanks for fixing this!

[falken, 2015-03-26 05:07:28]

The CQ bit was checked by falken@chromium.org

[commit-bot: I haz the power, 2015-03-26 05:08:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1038763005/1

[commit-bot: I haz the power, 2015-03-26 06:30:35]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-03-26 06:30:36]

Try jobs failed on following builders:
  win_chromium_rel_ng on tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_...)

[falken, 2015-03-26 07:22:29]

On 2015/03/26 06:30:36, I haz the power (commit-bot) wrote:
> Try jobs failed on following builders:
>   win_chromium_rel_ng on tryserver.chromium.win (JOB_FAILED,
>
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_...)

I guess the granularity of TimeTicks::Now may not be good on some platforms.
Revised the patch to artificially knock the time back a second and then test
that it got reset when expected.

[falken, 2015-03-26 08:16:05]

The CQ bit was checked by falken@chromium.org

[falken, 2015-03-26 08:16:05]

The patchset sent to the CQ was uploaded after l-g-t-m from kinuko@chromium.org
Link to the patchset: https://codereview.chromium.org/1038763005/#ps20001
(title: "reliably test timer being reset")

[commit-bot: I haz the power, 2015-03-26 08:16:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1038763005/20001

[commit-bot: I haz the power, 2015-03-26 09:22:06]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-03-26 09:22:35]

Patchset 2 (id:??) landed as
https://crrev.com/17f72bbde1bef95b10c2c56ced278a33dd74c05a
Cr-Commit-Position: refs/heads/master@{#322341}