Tune tap disambiguation triggering threshold.

Tune tap disambiguation triggering threshold.

UMA data shows that users disambiguate to the touch adjustment preferred
node twice as often as the next best candidate.  This shows the
disambiguation feature is overtriggering -- ideally, the probability
would be equal.

There is already logic to throw out candidates if their overlap area is
strongly outweighed by the best candidate.  This uses an arbitrary ratio
of 50%.  Increasing it to 75% doesn't visibly undertrigger when I expect
it to on desktop NYTimes sidebars on my Nexus 6P, so try that threshold
to improve the stats.

BUG=704323
Review-Url: https://codereview.chromium.org/2950553003
Cr-Commit-Position: refs/heads/master@{#480916}
Committed: https://chromium.googlesource.com/chromium/src/+/aca7a78d0cf36f18816de26361a34f0d0b9c7e6c

[aelias_OOO_until_Jul13, 2017-06-19 23:56:36]

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

[commit-bot: I haz the power, 2017-06-19 23:57:12]

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, 2017-06-20 00:52:54]

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

[commit-bot: I haz the power, 2017-06-20 00:52:55]

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

[aelias_OOO_until_Jul13, 2017-06-20 01:01:40]

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

[commit-bot: I haz the power, 2017-06-20 01:02:06]

Dry run: CQ is trying da patch.

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

[aelias_OOO_until_Jul13, 2017-06-20 01:10:00]

aelias@chromium.org changed reviewers:
+ bokan@chromium.org

[aelias_OOO_until_Jul13, 2017-06-20 01:10:10]

Hi bokan@, PTAL.

[commit-bot: I haz the power, 2017-06-20 03:34:05]

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

[commit-bot: I haz the power, 2017-06-20 03:34:06]

Dry run: This issue passed the CQ dry run.

[bokan, 2017-06-20 15:10:14]

lgtm

[aelias_OOO_until_Jul13, 2017-06-20 19:46:06]

The CQ bit was checked by aelias@chromium.org

[commit-bot: I haz the power, 2017-06-20 19:46:32]

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, 2017-06-20 19:54:36]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1497987966596400,
"parent_rev": "53d732d4e1201b48894dc529c7712bcd3b48092e", "commit_rev":
"aca7a78d0cf36f18816de26361a34f0d0b9c7e6c"}

[commit-bot: I haz the power, 2017-06-20 19:54:48]

Description was changed from

==========
Tune tap disambiguation triggering threshold.

UMA data shows that users disambiguate to the touch adjustment preferred
node twice as often as the next best candidate.  This shows the
disambiguation feature is overtriggering -- ideally, the probability
would be equal.

There is already logic to throw out candidates if their overlap area is
strongly outweighed by the best candidate.  This uses an arbitrary ratio
of 50%.  Increasing it to 75% doesn't visibly undertrigger when I expect
it to on desktop NYTimes sidebars on my Nexus 6P, so try that threshold
to improve the stats.

BUG=704323
==========

to

==========
Tune tap disambiguation triggering threshold.

UMA data shows that users disambiguate to the touch adjustment preferred
node twice as often as the next best candidate.  This shows the
disambiguation feature is overtriggering -- ideally, the probability
would be equal.

There is already logic to throw out candidates if their overlap area is
strongly outweighed by the best candidate.  This uses an arbitrary ratio
of 50%.  Increasing it to 75% doesn't visibly undertrigger when I expect
it to on desktop NYTimes sidebars on my Nexus 6P, so try that threshold
to improve the stats.

BUG=704323

Review-Url: https://codereview.chromium.org/2950553003
Cr-Commit-Position: refs/heads/master@{#480916}
Committed:
https://chromium.googlesource.com/chromium/src/+/aca7a78d0cf36f18816de26361a3...
==========

[commit-bot: I haz the power, 2017-06-20 19:54:49]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/chromium/src/+/aca7a78d0cf36f18816de26361a3...