base::ImportantFileWriter: Add histogram entry for flush error.

base::ImportantFileWriter: Add histogram entry for flush error.

This is and addendum to 604e5c18 (commit 300230), cf.
https://codereview.chromium.org/663463002/ .

BUG=none

Committed: https://crrev.com/d704ce056777a651c23d31e9f12bf45490a630b5
Cr-Commit-Position: refs/heads/master@{#300513}

[Thiemo Nagel, 2014-10-21 08:14:04]

tnagel@chromium.org changed reviewers:
+ asvitkine@google.com, rvargas@chromium.org

[Thiemo Nagel, 2014-10-21 08:14:04]

tnagel@chromium.org changed required reviewers:
+ asvitkine@google.com, rvargas@chromium.org

[Thiemo Nagel, 2014-10-21 08:17:08]

Hi Alexei, Ricardo,

this now the last of the UMA/ImportantFileWriter CLs.  Could you please take a
look?

Thank you!
Thiemo

[Thiemo Nagel, 2014-10-21 08:17:47]

tnagel@chromium.org changed reviewers:
+ asvitkine@chromium.org
- asvitkine@google.com

[Thiemo Nagel, 2014-10-21 08:17:47]

tnagel@chromium.org changed required reviewers:
+ asvitkine@chromium.org
- asvitkine@google.com

[Alexei Svitkine (slow), 2014-10-21 14:43:44]

The CQ bit was checked by asvitkine@chromium.org

[Alexei Svitkine (slow), 2014-10-21 14:43:44]

lgtm

[commit-bot: I haz the power, 2014-10-21 14:44:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/639823009/1

[commit-bot: I haz the power, 2014-10-21 14:44:39]

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

[commit-bot: I haz the power, 2014-10-21 14:44:40]

All required reviewers (with asterisk prefixes) have not yet approved this CL.

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[Thiemo Nagel, 2014-10-21 14:48:11]

Alexei, I think I accidentally sent the review to your @google.com address. 
Could that be the reason why commit doesn't work?

[Thiemo Nagel, 2014-10-21 14:48:40]

tnagel@chromium.org changed required reviewers:
- rvargas@chromium.org

[Thiemo Nagel, 2014-10-21 14:48:45]

The CQ bit was checked by tnagel@chromium.org

[commit-bot: I haz the power, 2014-10-21 14:49:18]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/639823009/1

[Thiemo Nagel, 2014-10-21 14:51:45]

On 2014/10/21 14:48:11, Thiemo Nagel wrote:
> Alexei, I think I accidentally sent the review to your @google.com address. 
> Could that be the reason why commit doesn't work?

The above is not correct.  Actually, the problem was the * before Ricardo's
name.  Sorry for the noise!

[commit-bot: I haz the power, 2014-10-21 16:39:58]

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

[commit-bot: I haz the power, 2014-10-21 16:39:59]

Try jobs failed on following builders:
  linux_chromium_rel_swarming on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Thiemo Nagel, 2014-10-21 16:48:23]

The CQ bit was checked by tnagel@chromium.org

[commit-bot: I haz the power, 2014-10-21 16:49:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/639823009/1

[commit-bot: I haz the power, 2014-10-21 17:26:43]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-21 17:28:01]

Patchset 1 (id:??) landed as
https://crrev.com/d704ce056777a651c23d31e9f12bf45490a630b5
Cr-Commit-Position: refs/heads/master@{#300513}