Add Login.PromptToLoginTime UMA metric

Add Login.PromptToLoginTime UMA metric

This is similar to Login.PromptToCompleteLoginTime, but for existing
users.

BUG=726345
TEST=manually confirmed that the path is taken when an existing
 user signs into Chrome OS

Review-Url: https://codereview.chromium.org/2902373002
Cr-Commit-Position: refs/heads/master@{#474885}
Committed: https://chromium.googlesource.com/chromium/src/+/5f7fd11473c746726e2e1917680a34acde058f19

[Yusuke Sato, 2017-05-25 02:52:10]

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

[commit-bot: I haz the power, 2017-05-25 02:53:13]

Dry run: 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, 2017-05-25 04:36:17]

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

[commit-bot: I haz the power, 2017-05-25 04:36:18]

Dry run: This issue passed the CQ dry run.

[Yusuke Sato, 2017-05-25 15:23:37]

yusukes@chromium.org changed reviewers:
+ afakhry@chromium.org

[Yusuke Sato, 2017-05-25 15:23:38]

Please take a look.

[Yusuke Sato, 2017-05-25 15:25:21]

Description was changed from

==========
Add Login.PromptToLoginTime UMA metric

This is similar to Login.PromptToCompleteLoginTime, but for existing
users.

BUG=b/62062279
TEST=manually confirmed that the path is taken when an existing
 user signs into Chrome OS
==========

to

==========
Add Login.PromptToLoginTime UMA metric

This is similar to Login.PromptToCompleteLoginTime, but for existing
users.

BUG=726345
TEST=manually confirmed that the path is taken when an existing
 user signs into Chrome OS
==========

[afakhry, 2017-05-25 16:00:38]

afakhry@chromium.org changed reviewers:
+ alemate@chromium.org

[afakhry, 2017-05-25 16:00:39]

I'm not the owner of either files, so I'm going to delegate to alemate@

[Yusuke Sato, 2017-05-25 21:08:51]

yusukes@chromium.org changed reviewers:
+ isherman@chromium.org

[Yusuke Sato, 2017-05-25 21:08:51]

Thanks Ahmed.

+isherman@ for the xml file too. Please have a look.

[Ilya Sherman, 2017-05-25 22:04:41]

Metrics LGTM, thanks.

[Alexander Alekseev, 2017-05-26 01:54:29]

lgtm

[Yusuke Sato, 2017-05-26 02:35:38]

thanks!

[Yusuke Sato, 2017-05-26 02:35:43]

The CQ bit was checked by yusukes@chromium.org

[commit-bot: I haz the power, 2017-05-26 02:37:01]

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, 2017-05-26 02:42:10]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1495766143136510, "parent_rev":
"664bafb55e38f92f6ba470a7311ce4bca23f5888", "commit_rev":
"5f7fd11473c746726e2e1917680a34acde058f19"}

[commit-bot: I haz the power, 2017-05-26 02:42:21]

Description was changed from

==========
Add Login.PromptToLoginTime UMA metric

This is similar to Login.PromptToCompleteLoginTime, but for existing
users.

BUG=726345
TEST=manually confirmed that the path is taken when an existing
 user signs into Chrome OS
==========

to

==========
Add Login.PromptToLoginTime UMA metric

This is similar to Login.PromptToCompleteLoginTime, but for existing
users.

BUG=726345
TEST=manually confirmed that the path is taken when an existing
 user signs into Chrome OS

Review-Url: https://codereview.chromium.org/2902373002
Cr-Commit-Position: refs/heads/master@{#474885}
Committed:
https://chromium.googlesource.com/chromium/src/+/5f7fd11473c746726e2e1917680a...
==========

[commit-bot: I haz the power, 2017-05-26 02:42:23]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/5f7fd11473c746726e2e1917680a...