Add Startup.BrowserMessageLoopStart.To.NonEmptyPaint2 metric.

Add Startup.BrowserMessageLoopStart.To.NonEmptyPaint2 metric.

This measures the time between Startup.BrowserMessageLoopStartTime
being logged and Startup.FirstWebContents.NonEmptyPaint2 being logged.

Also adds Startup.BrowserMessageLoopStart.To.MainNavigationStart.

Goal is to be able to easier diagnose problems and also understand impact
of improvements. For example, I plan to use this when I do more experimentation
with my resource reordering change.

BUG=634437
Review-Url: https://codereview.chromium.org/2870993002
Cr-Commit-Position: refs/heads/master@{#470573}
Committed: https://chromium.googlesource.com/chromium/src/+/d80d9426357c72cc7d547d84196890efb999be36

[Alexei Svitkine (slow), 2017-05-09 19:21:58]

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

[commit-bot: I haz the power, 2017-05-09 19:23:12]

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, 2017-05-09 19:52:23]

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

[commit-bot: I haz the power, 2017-05-09 19:52:24]

Dry run: Try jobs failed on following builders:
  android_arm64_dbg_recipe on master.tryserver.chromium.android (JOB_FAILED,
https://build.chromium.org/p/tryserver.chromium.android/builders/android_arm6...)

[Alexei Svitkine (slow), 2017-05-09 19:59:00]

Description was changed from

==========
Add Startup.BrowserMessageLoopStartToNonEmptyPaintTime metric.

This measures the time between Startup.BrowserMessageLoopStartTime
being logged and Startup.FirstWebContents.NonEmptyPaint2 being logged.

BUG=
==========

to

==========
Add Startup.BrowserMessageLoopStart.To.NonEmptyPaint2 metric.

This measures the time between Startup.BrowserMessageLoopStartTime
being logged and Startup.FirstWebContents.NonEmptyPaint2 being logged.

Also adds Startup.BrowserMessageLoopStart.To.MainNavigationStart.

Goal is to be able to easier diagnose problems and also understand impact
of improvements. For example, I plan to use this when I do more experimentation
with my resource reordering change.

BUG=634437
==========

[Alexei Svitkine (slow), 2017-05-09 20:00:31]

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

[Alexei Svitkine (slow), 2017-05-09 20:00:33]

Patchset #1 (id:1) has been deleted

[Alexei Svitkine (slow), 2017-05-09 20:00:44]

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

[commit-bot: I haz the power, 2017-05-09 20:01:51]

Dry run: CQ is trying da patch.

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

[gab, 2017-05-09 20:12:53]

So many metrics! Would be nice if they could be organized as parent child
relationship so that by default we only see core metrics which can then be
subdivided into diagnosis metrics...

lgtm I guess though if you think these will be useful to you..

[Alexei Svitkine (slow), 2017-05-09 20:25:17]

Agree, at some point we should clean these up. But I think we're still at the
stage where we need more data.

(As an aside, the nice thing now is that Brian added an optimization to not
allocate all the buckets when a single value is logged in a histogram, so all of
these should be much cheaper now.)

[Alexei Svitkine (slow), 2017-05-09 20:25:21]

The CQ bit was unchecked by asvitkine@chromium.org

[Alexei Svitkine (slow), 2017-05-09 20:25:24]

The CQ bit was checked by asvitkine@chromium.org

[commit-bot: I haz the power, 2017-05-09 20:25:37]

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, 2017-05-09 22:35:47]

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

[commit-bot: I haz the power, 2017-05-09 22:35:48]

Try jobs failed on following builders:
  chromeos_amd64-generic_chromium_compile_only_ng on
master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromeos_amd64-...)

[Alexei Svitkine (slow), 2017-05-09 22:48:54]

The CQ bit was checked by asvitkine@chromium.org

[commit-bot: I haz the power, 2017-05-09 22:50:24]

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, 2017-05-10 00:53:14]

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

[commit-bot: I haz the power, 2017-05-10 00:53:15]

Try jobs failed on following builders:
  chromeos_amd64-generic_chromium_compile_only_ng on
master.tryserver.chromium.linux (JOB_TIMED_OUT, build has not started yet;
builder either lacks capacity or does not exist (misspelled?))
  chromium_presubmit on master.tryserver.chromium.linux (JOB_TIMED_OUT, build
has not started yet; builder either lacks capacity or does not exist
(misspelled?))

[Alexei Svitkine (slow), 2017-05-10 03:01:09]

The CQ bit was checked by asvitkine@chromium.org

[commit-bot: I haz the power, 2017-05-10 03:03:06]

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, 2017-05-10 05:38:46]

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

[commit-bot: I haz the power, 2017-05-10 05:38:47]

Try jobs failed on following builders:
  linux_chromium_chromeos_ozone_rel_ng on master.tryserver.chromium.linux
(JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Alexei Svitkine (slow), 2017-05-10 14:13:28]

The CQ bit was checked by asvitkine@chromium.org

[commit-bot: I haz the power, 2017-05-10 14:14:10]

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, 2017-05-10 15:00:34]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1494425608010460,
"parent_rev": "b0222f5f67d4edb059c7ca478a8349e12f6943de", "commit_rev":
"d80d9426357c72cc7d547d84196890efb999be36"}

[commit-bot: I haz the power, 2017-05-10 15:00:47]

Description was changed from

==========
Add Startup.BrowserMessageLoopStart.To.NonEmptyPaint2 metric.

This measures the time between Startup.BrowserMessageLoopStartTime
being logged and Startup.FirstWebContents.NonEmptyPaint2 being logged.

Also adds Startup.BrowserMessageLoopStart.To.MainNavigationStart.

Goal is to be able to easier diagnose problems and also understand impact
of improvements. For example, I plan to use this when I do more experimentation
with my resource reordering change.

BUG=634437
==========

to

==========
Add Startup.BrowserMessageLoopStart.To.NonEmptyPaint2 metric.

This measures the time between Startup.BrowserMessageLoopStartTime
being logged and Startup.FirstWebContents.NonEmptyPaint2 being logged.

Also adds Startup.BrowserMessageLoopStart.To.MainNavigationStart.

Goal is to be able to easier diagnose problems and also understand impact
of improvements. For example, I plan to use this when I do more experimentation
with my resource reordering change.

BUG=634437

Review-Url: https://codereview.chromium.org/2870993002
Cr-Commit-Position: refs/heads/master@{#470573}
Committed:
https://chromium.googlesource.com/chromium/src/+/d80d9426357c72cc7d547d841968...
==========

[commit-bot: I haz the power, 2017-05-10 15:00:48]

Committed patchset #1 (id:20001) as
https://chromium.googlesource.com/chromium/src/+/d80d9426357c72cc7d547d841968...