Add UMA histogram for AIA fetching error codes

Add UMA histogram for AIA fetching error codes

This CL records the net error code of AIA fetches attempted by
CertVerifyProcAndroid.

On canary AIA fetching is a bit less effective than I expected (kicking in
successfully for ~30% of ERR_CERT_AUTHORITY_INVALID errors instead of expected
~50%), and I'm trying to narrow down if that is due to e.g. random network
failures, or something else like insufficient path-building.

BUG=688272
Review-Url: https://codereview.chromium.org/2680323003
Cr-Commit-Position: refs/heads/master@{#449769}
Committed: https://chromium.googlesource.com/chromium/src/+/96b1db92fdad353c2702419886d5732574eaab33

[estark, 2017-02-08 19:56:45]

The CQ bit was checked by estark@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-02-08 19:57:53]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[estark, 2017-02-08 19:58:10]

estark@chromium.org changed reviewers:
+ eroman@chromium.org, holte@chromium.org

[estark, 2017-02-08 19:58:10]

eroman can you please review the net/ change?
holte can you please review histograms.xml?
Thanks!

[Steven Holte, 2017-02-08 22:21:13]

histograms lgtm

[commit-bot: I haz the power, 2017-02-08 23:14:15]

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

[commit-bot: I haz the power, 2017-02-08 23:14:16]

Dry run: This issue passed the CQ dry run.

[eroman, 2017-02-10 20:39:38]

lgtm

[estark, 2017-02-10 21:30:19]

The CQ bit was checked by estark@chromium.org

[commit-bot: I haz the power, 2017-02-10 21:31:02]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-02-10 22:39:01]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1486762219384240, "parent_rev":
"f30aaa7e5f0c05b24bf8b6a48ea5906db0ada1dc", "commit_rev":
"96b1db92fdad353c2702419886d5732574eaab33"}

[commit-bot: I haz the power, 2017-02-10 22:39:42]

Description was changed from

==========
Add UMA histogram for AIA fetching error codes

This CL records the net error code of AIA fetches attempted by
CertVerifyProcAndroid.

On canary AIA fetching is a bit less effective than I expected (kicking in
successfully for ~30% of ERR_CERT_AUTHORITY_INVALID errors instead of expected
~50%), and I'm trying to narrow down if that is due to e.g. random network
failures, or something else like insufficient path-building.

BUG=688272
==========

to

==========
Add UMA histogram for AIA fetching error codes

This CL records the net error code of AIA fetches attempted by
CertVerifyProcAndroid.

On canary AIA fetching is a bit less effective than I expected (kicking in
successfully for ~30% of ERR_CERT_AUTHORITY_INVALID errors instead of expected
~50%), and I'm trying to narrow down if that is due to e.g. random network
failures, or something else like insufficient path-building.

BUG=688272

Review-Url: https://codereview.chromium.org/2680323003
Cr-Commit-Position: refs/heads/master@{#449769}
Committed:
https://chromium.googlesource.com/chromium/src/+/96b1db92fdad353c2702419886d5...
==========

[commit-bot: I haz the power, 2017-02-10 22:39:44]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/96b1db92fdad353c2702419886d5...