Record errno for SyncParent.

Record errno for SyncParent.

We weren't recording errors for SyncParent and it turns out to be the
2nd most common source of I/O errors on CrOS when opening a database.

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=221420

[dgrogan, 2013-09-04 22:10:47]

Josh, could you review this 4-liner?

[dgrogan, 2013-09-04 22:11:42]

Whoops, 11 liner.

[alecflett, 2013-09-04 23:27:11]

lgtm

yay wacky old unix APIs!

lgtm

[jsbell, 2013-09-04 23:33:52]

lgtm2

[commit-bot: I haz the power, 2013-09-04 23:38:13]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dgrogan@chromium.org/23681009/1

[commit-bot: I haz the power, 2013-09-05 00:47:11]

Retried try job too often on ios_dbg_simulator for step(s) ui_unittests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=ios_dbg_si...

[commit-bot: I haz the power, 2013-09-05 14:13:35]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dgrogan@chromium.org/23681009/1

[commit-bot: I haz the power, 2013-09-05 14:30:51]

Change committed as 221420