Fix recording of "Time to error histograms".

Fix recording of "Time to error histograms".

Changes use of URLRequest::request_time() to URLRequest::creation_time(),
which is much closer to the information actually desired (how long the
consumer of the request waited for an error).

BUG=487663
R=mmenke@chromium.org

Committed: https://crrev.com/1f43a06a1ebfdb2fdb16bd3356dd6baa7cf6b4a5
Cr-Commit-Position: refs/heads/master@{#337899}

[Randy Smith (Not in Mondays), 2015-07-08 18:56:26]

Matt: Simple fix for time-to-error histograms.  PTAL?

[mmenke, 2015-07-08 18:57:56]

On 2015/07/08 18:56:26, rdsmith wrote:
> Matt: Simple fix for time-to-error histograms.  PTAL?

LGTM, apologies for not catching this earlier.

[Randy Smith (Not in Mondays), 2015-07-08 19:09:19]

rdsmith@chromium.org changed reviewers:
+ asvitkine@chromium.org

[Randy Smith (Not in Mondays), 2015-07-08 19:10:36]

On 2015/07/08 18:57:56, mmenke wrote:
> On 2015/07/08 18:56:26, rdsmith wrote:
> > Matt: Simple fix for time-to-error histograms.  PTAL?
> 
> LGTM, apologies for not catching this earlier.

No worries--my responsibility :-J.  Thanks for the quick review.

Alexei, could you look at histograms.xml?

[Alexei Svitkine (slow), 2015-07-08 19:16:23]

lgtm

https://codereview.chromium.org/1211023003/diff/1/tools/metrics/histograms/hi...
File tools/metrics/histograms/histograms.xml (right):

https://codereview.chromium.org/1211023003/diff/1/tools/metrics/histograms/hi...
tools/metrics/histograms/histograms.xml:22642: +    Revving version due to
failure in original implementation.
Nit: Mention the name of the other histogram explicitly.

[Randy Smith (Not in Mondays), 2015-07-08 19:20:34]

Thanks!

https://codereview.chromium.org/1211023003/diff/1/tools/metrics/histograms/hi...
File tools/metrics/histograms/histograms.xml (right):

https://codereview.chromium.org/1211023003/diff/1/tools/metrics/histograms/hi...
tools/metrics/histograms/histograms.xml:22642: +    Revving version due to
failure in original implementation.
On 2015/07/08 19:16:23, Alexei Svitkine wrote:
> Nit: Mention the name of the other histogram explicitly.

Done.

[Randy Smith (Not in Mondays), 2015-07-08 19:20:39]

The CQ bit was checked by rdsmith@chromium.org

[Randy Smith (Not in Mondays), 2015-07-08 19:20:40]

The patchset sent to the CQ was uploaded after l-g-t-m from
asvitkine@chromium.org, mmenke@chromium.org
Link to the patchset: https://codereview.chromium.org/1211023003/#ps20001
(title: "Xref new histogram name from obsolete histogram.")

[commit-bot: I haz the power, 2015-07-08 19:21:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1211023003/20001

[commit-bot: I haz the power, 2015-07-08 20:34:30]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-07-08 20:35:22]

Patchset 2 (id:??) landed as
https://crrev.com/1f43a06a1ebfdb2fdb16bd3356dd6baa7cf6b4a5
Cr-Commit-Position: refs/heads/master@{#337899}