Add use counters for the passive option to addEventListener

Add use counters for the passive option to addEventListener

We've long tracked the primary metric - how often do scrolls block
unnecessarily (via the Event.PassiveListeners histogram) but the results
are complex.  To help interpret the results let's also just count
how common it is for a page to use the 'passive' option anywhere.
This isn't directly meaningful by itself in terms of outcomes, but
is still useful as a rough indication of developer adoption for the API.

BUG=489802
TBR=rkaplow

Committed: https://crrev.com/e95fc1fa03174e0064d73638d9e6ad364ecdb514
Cr-Commit-Position: refs/heads/master@{#401703}

[Rick Byers, 2016-06-23 18:27:02]

Description was changed from

==========
Add use counters for the passive option to addEventListener

We've long tracked the primary metric - how often do scrolls block
unnecessarily (via the Event.PassiveListeners histogram) but the results
are complex.  To help interpret the results let's also just count
how common it is for a page to use the 'passive' option anywhere.
This isn't directly meaningful by itself in terms of outcomes, but
is still useful as a rough indication of developer adoption for the API.

BUG=489802
==========

to

==========
Add use counters for the passive option to addEventListener

We've long tracked the primary metric - how often do scrolls block
unnecessarily (via the Event.PassiveListeners histogram) but the results
are complex.  To help interpret the results let's also just count
how common it is for a page to use the 'passive' option anywhere.
This isn't directly meaningful by itself in terms of outcomes, but
is still useful as a rough indication of developer adoption for the API.

BUG=489802
==========

[Rick Byers, 2016-06-23 18:27:03]

rbyers@chromium.org changed reviewers:
+ dtapuska@chromium.org, rkaplow@chromium.org

[Rick Byers, 2016-06-23 18:27:24]

dtapuska@ PTAL

+rkaplow for histograms.xml OWNERS

[dtapuska, 2016-06-23 18:30:20]

On 2016/06/23 18:27:24, Rick Byers wrote:
> dtapuska@ PTAL
> 
> +rkaplow for histograms.xml OWNERS

lgtm

[Rick Byers, 2016-06-23 20:09:11]

Description was changed from

==========
Add use counters for the passive option to addEventListener

We've long tracked the primary metric - how often do scrolls block
unnecessarily (via the Event.PassiveListeners histogram) but the results
are complex.  To help interpret the results let's also just count
how common it is for a page to use the 'passive' option anywhere.
This isn't directly meaningful by itself in terms of outcomes, but
is still useful as a rough indication of developer adoption for the API.

BUG=489802
==========

to

==========
Add use counters for the passive option to addEventListener

We've long tracked the primary metric - how often do scrolls block
unnecessarily (via the Event.PassiveListeners histogram) but the results
are complex.  To help interpret the results let's also just count
how common it is for a page to use the 'passive' option anywhere.
This isn't directly meaningful by itself in terms of outcomes, but
is still useful as a rough indication of developer adoption for the API.

BUG=489802
TBR=rkaplow
==========

[Rick Byers, 2016-06-23 20:09:43]

On 2016/06/23 18:30:20, dtapuska wrote:
> On 2016/06/23 18:27:24, Rick Byers wrote:
> > dtapuska@ PTAL
> > 
> > +rkaplow for histograms.xml OWNERS

TBRing rkaplow since we've previously agreed simple UseCounter enum updates
don't need review.

[Rick Byers, 2016-06-23 20:09:50]

The CQ bit was checked by rbyers@chromium.org

[commit-bot: I haz the power, 2016-06-23 20:10:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2090903003/20001

[commit-bot: I haz the power, 2016-06-23 20:24:58]

Description was changed from

==========
Add use counters for the passive option to addEventListener

We've long tracked the primary metric - how often do scrolls block
unnecessarily (via the Event.PassiveListeners histogram) but the results
are complex.  To help interpret the results let's also just count
how common it is for a page to use the 'passive' option anywhere.
This isn't directly meaningful by itself in terms of outcomes, but
is still useful as a rough indication of developer adoption for the API.

BUG=489802
TBR=rkaplow
==========

to

==========
Add use counters for the passive option to addEventListener

We've long tracked the primary metric - how often do scrolls block
unnecessarily (via the Event.PassiveListeners histogram) but the results
are complex.  To help interpret the results let's also just count
how common it is for a page to use the 'passive' option anywhere.
This isn't directly meaningful by itself in terms of outcomes, but
is still useful as a rough indication of developer adoption for the API.

BUG=489802
TBR=rkaplow
==========

[commit-bot: I haz the power, 2016-06-23 20:24:59]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-06-23 20:26:49]

Description was changed from

==========
Add use counters for the passive option to addEventListener

We've long tracked the primary metric - how often do scrolls block
unnecessarily (via the Event.PassiveListeners histogram) but the results
are complex.  To help interpret the results let's also just count
how common it is for a page to use the 'passive' option anywhere.
This isn't directly meaningful by itself in terms of outcomes, but
is still useful as a rough indication of developer adoption for the API.

BUG=489802
TBR=rkaplow
==========

to

==========
Add use counters for the passive option to addEventListener

We've long tracked the primary metric - how often do scrolls block
unnecessarily (via the Event.PassiveListeners histogram) but the results
are complex.  To help interpret the results let's also just count
how common it is for a page to use the 'passive' option anywhere.
This isn't directly meaningful by itself in terms of outcomes, but
is still useful as a rough indication of developer adoption for the API.

BUG=489802
TBR=rkaplow

Committed: https://crrev.com/e95fc1fa03174e0064d73638d9e6ad364ecdb514
Cr-Commit-Position: refs/heads/master@{#401703}
==========

[commit-bot: I haz the power, 2016-06-23 20:26:51]

Patchset 2 (id:??) landed as
https://crrev.com/e95fc1fa03174e0064d73638d9e6ad364ecdb514
Cr-Commit-Position: refs/heads/master@{#401703}