Record histograms for DRP secure proxy check failures caused by CPs.

Record histograms for DRP secure proxy check failures caused by CPs.

When the user is on a network with a captive portal, oftentimes the Data
Reduction Proxy's secure proxy check will fail when it receives a
redirect to the captive portal's login page. This CL causes these
failures to be recorded in the existing
DataReductionProxy.ProbeURLNetError histogram, together with the other
possible causes of failure.

BUG=613023
Committed: https://crrev.com/75d1dec0ee01ea02d8267d1e09cba0d958d80540
Cr-Commit-Position: refs/heads/master@{#394984}

[sclittle, 2016-05-19 02:32:04]

sclittle@chromium.org changed reviewers:
+ tbansal@chromium.org

[tbansal1, 2016-05-19 16:37:15]

lgtm

[sclittle, 2016-05-20 01:25:28]

The CQ bit was checked by sclittle@chromium.org

[sclittle, 2016-05-20 01:25:28]

The patchset sent to the CQ was uploaded after l-g-t-m from tbansal@chromium.org
Link to the patchset: https://codereview.chromium.org/1996513002/#ps20001
(title: "Rebased on other CL")

[commit-bot: I haz the power, 2016-05-20 01:26:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1996513002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1996513002/20001

[commit-bot: I haz the power, 2016-05-20 03:38:04]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-05-20 03:39:31]

Description was changed from

==========
Record histograms for DRP secure proxy check failures caused by CPs.

When the user is on a network with a captive portal, oftentimes the Data
Reduction Proxy's secure proxy check will fail when it receives a
redirect to the captive portal's login page. This CL causes these
failures to be recorded in the existing
DataReductionProxy.ProbeURLNetError histogram, together with the other
possible causes of failure.

BUG=613023
==========

to

==========
Record histograms for DRP secure proxy check failures caused by CPs.

When the user is on a network with a captive portal, oftentimes the Data
Reduction Proxy's secure proxy check will fail when it receives a
redirect to the captive portal's login page. This CL causes these
failures to be recorded in the existing
DataReductionProxy.ProbeURLNetError histogram, together with the other
possible causes of failure.

BUG=613023

Committed: https://crrev.com/75d1dec0ee01ea02d8267d1e09cba0d958d80540
Cr-Commit-Position: refs/heads/master@{#394984}
==========

[commit-bot: I haz the power, 2016-05-20 03:39:32]

Patchset 2 (id:??) landed as
https://crrev.com/75d1dec0ee01ea02d8267d1e09cba0d958d80540
Cr-Commit-Position: refs/heads/master@{#394984}