Allow immediate tasks to run even when virtual time can't advance

Allow immediate tasks to run even when virtual time can't advance

The main point of preventing virtual time from advancing is to save
CPU by avoiding running timers when we don't need to.  We still
however need immediate tasks to run so that the page load can
progress.

BUG=546953
Committed: https://crrev.com/f4b5d32e3bb996b3e65e909f2b6bd9ff5a41127a
Cr-Commit-Position: refs/heads/master@{#375166}

[alex clarke (OOO till 29th), 2016-02-12 11:37:01]

The CQ bit was checked by alexclarke@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-02-12 11:37:05]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1697523002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1697523002/1

[alex clarke (OOO till 29th), 2016-02-12 11:37:20]

alexclarke@chromium.org changed reviewers:
+ skyostil@chromium.org

[alex clarke (OOO till 29th), 2016-02-12 11:37:21]

PTAL

[Sami, 2016-02-12 12:06:32]

lgtm.

By the way is there any problem here with interval timers that are delayed
enough to set the next fire time in the past?

[alex clarke (OOO till 29th), 2016-02-12 12:23:55]

The CQ bit was unchecked by alexclarke@chromium.org

[alex clarke (OOO till 29th), 2016-02-12 12:23:56]

The CQ bit was checked by alexclarke@chromium.org

[commit-bot: I haz the power, 2016-02-12 12:24:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1697523002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1697523002/1

[commit-bot: I haz the power, 2016-02-12 12:42:56]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-02-16 22:42:48]

Description was changed from

==========
Allow immediate tasks to run even when virtual time can't advance

The main point of preventing virtual time from advancing is to save
CPU by avoiding running timers when we don't need to.  We still
however need immediate tasks to run so that the page load can
progress.

BUG=546953
==========

to

==========
Allow immediate tasks to run even when virtual time can't advance

The main point of preventing virtual time from advancing is to save
CPU by avoiding running timers when we don't need to.  We still
however need immediate tasks to run so that the page load can
progress.

BUG=546953

Committed: https://crrev.com/f4b5d32e3bb996b3e65e909f2b6bd9ff5a41127a
Cr-Commit-Position: refs/heads/master@{#375166}
==========

[commit-bot: I haz the power, 2016-02-16 22:42:49]

Patchset 1 (id:??) landed as
https://crrev.com/f4b5d32e3bb996b3e65e909f2b6bd9ff5a41127a
Cr-Commit-Position: refs/heads/master@{#375166}