Increase warning threshold for "super long" delayed tasks.

Increase warning threshold for "super long" delayed tasks.

To reduce debug logging spam, this increases the warning threshold for
posting "super long" delayed tasks to 14 days (was ~18 minutes before).
Also, make the logging message more readable by printing values in terms
of seconds rather than microseconds.

BUG=450045
Committed: https://crrev.com/beed41d812e408cbda48236d5cdcc8418926717f
Cr-Commit-Position: refs/heads/master@{#314778}

[miu, 2015-02-05 05:31:40]

miu@chromium.org changed reviewers:
+ thestig@chromium.org

[miu, 2015-02-05 05:31:40]

thestig: PTAL.  Changes made as discussed in bug 450045.

[brucedawson, 2015-02-05 05:40:15]

brucedawson@chromium.org changed reviewers:
+ brucedawson@chromium.org

[brucedawson, 2015-02-05 05:40:15]

lgtm

[miu, 2015-02-05 06:04:35]

New patchsets have been uploaded after l-g-t-m from brucedawson@chromium.org

[Lei Zhang, 2015-02-05 06:13:29]

lgtm

[miu, 2015-02-05 09:10:32]

The CQ bit was checked by miu@chromium.org

[commit-bot: I haz the power, 2015-02-05 09:11:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/897173004/20001

[commit-bot: I haz the power, 2015-02-05 09:15:13]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-02-05 09:16:08]

Patchset 2 (id:??) landed as
https://crrev.com/beed41d812e408cbda48236d5cdcc8418926717f
Cr-Commit-Position: refs/heads/master@{#314778}