Add use count for click retargeting due to capture

Add use count for click retargeting due to capture

Since pointer capture changes the target of the
following events for that pointer it potentially
changes the target of the click. Considering the
changed target for calculating the click target
may cause some websites to break. So this CL
adds a usecount for that case. Note this is an
upper bound on the breakage as lots of pages
may not have any listener for these click events
or just not break due to this retargetting.

BUG=699933
Review-Url: https://codereview.chromium.org/2747763002
Cr-Commit-Position: refs/heads/master@{#456933}
Committed: https://chromium.googlesource.com/chromium/src/+/18a3165ddb7326845a6028b1e3f93f7d347bde95

[Navid Zolghadr, 2017-03-13 14:45:21]

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

[commit-bot: I haz the power, 2017-03-13 14:45:42]

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

[Navid Zolghadr, 2017-03-13 14:46:04]

nzolghadr@chromium.org changed reviewers:
+ dtapuska@chromium.org, mustaq@chromium.org

[mustaq, 2017-03-13 14:55:42]

lgtm

[commit-bot: I haz the power, 2017-03-13 17:36:57]

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

[commit-bot: I haz the power, 2017-03-13 17:36:58]

Dry run: This issue passed the CQ dry run.

[Navid Zolghadr, 2017-03-13 19:19:15]

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

[Navid Zolghadr, 2017-03-13 19:19:15]

bokan@ could you please review the changes under:

third_party/WebKit/Source/core/*

[Navid Zolghadr, 2017-03-13 19:22:00]

nzolghadr@chromium.org changed reviewers:
+ holte@chromium.org

[Navid Zolghadr, 2017-03-13 19:22:01]

holte@ could you please the changed in:

tools/metrics/histograms/histograms.xml

[bokan, 2017-03-13 21:29:05]

rs lgtm based on Mustaq's review.

[Steven Holte, 2017-03-14 22:21:29]

histograms lgtm

[Navid Zolghadr, 2017-03-14 22:38:36]

The CQ bit was checked by nzolghadr@chromium.org

[commit-bot: I haz the power, 2017-03-14 22:39:34]

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, 2017-03-15 01:10:29]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1489531116498390, "parent_rev":
"a9fac83ffe6ac844faaed0f5b6f59edbac461ec0", "commit_rev":
"18a3165ddb7326845a6028b1e3f93f7d347bde95"}

[commit-bot: I haz the power, 2017-03-15 01:11:18]

Description was changed from

==========
Add use count for click retargeting due to capture

Since pointer capture changes the target of the
following events for that pointer it potentially
changes the target of the click. Considering the
changed target for calculating the click target
may cause some websites to break. So this CL
adds a usecount for that case. Note this is an
upper bound on the breakage as lots of pages
may not have any listener for these click events
or just not break due to this retargetting.

BUG=699933
==========

to

==========
Add use count for click retargeting due to capture

Since pointer capture changes the target of the
following events for that pointer it potentially
changes the target of the click. Considering the
changed target for calculating the click target
may cause some websites to break. So this CL
adds a usecount for that case. Note this is an
upper bound on the breakage as lots of pages
may not have any listener for these click events
or just not break due to this retargetting.

BUG=699933

Review-Url: https://codereview.chromium.org/2747763002
Cr-Commit-Position: refs/heads/master@{#456933}
Committed:
https://chromium.googlesource.com/chromium/src/+/18a3165ddb7326845a6028b1e3f9...
==========

[commit-bot: I haz the power, 2017-03-15 01:11:19]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/18a3165ddb7326845a6028b1e3f9...