nodeAtPoint(): Perform the early-check EARLY.

nodeAtPoint(): Perform the early-check EARLY.

Hit-testing overflow controls before checking if we need to do anything at all
affected performance, so just remove the LayoutBlock override for nodeAtPoint()
and hit test overflow controls there, but do so AFTER we have made sure that
the point is within bounds.

Fixes 15% performance regression for
PerformanceTests/Events/hit-test-lots-of-layers.html

BUG=610250
Committed: https://crrev.com/4f8e71034d840043dcf49bb51e8f911ec284f709
Cr-Commit-Position: refs/heads/master@{#392626}

[mstensho (USE GERRIT), 2016-05-10 07:27:16]

mstensho@opera.com changed reviewers:
+ eae@chromium.org, szager@chromium.org, wkorman@chromium.org

[eae, 2016-05-10 15:33:30]

LGTM

[eae, 2016-05-10 15:33:35]

The CQ bit was checked by eae@chromium.org

[commit-bot: I haz the power, 2016-05-10 15:33:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1960373002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1960373002/1

[commit-bot: I haz the power, 2016-05-10 16:44:33]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-10 16:45:50]

Description was changed from

==========
nodeAtPoint(): Perform the early-check EARLY.

Hit-testing overflow controls before checking if we need to do anything at all
affected performance, so just remove the LayoutBlock override for nodeAtPoint()
and hit test overflow controls there, but do so AFTER we have made sure that
the point is within bounds.

Fixes 15% performance regression for
PerformanceTests/Events/hit-test-lots-of-layers.html

BUG=610250
==========

to

==========
nodeAtPoint(): Perform the early-check EARLY.

Hit-testing overflow controls before checking if we need to do anything at all
affected performance, so just remove the LayoutBlock override for nodeAtPoint()
and hit test overflow controls there, but do so AFTER we have made sure that
the point is within bounds.

Fixes 15% performance regression for
PerformanceTests/Events/hit-test-lots-of-layers.html

BUG=610250

Committed: https://crrev.com/4f8e71034d840043dcf49bb51e8f911ec284f709
Cr-Commit-Position: refs/heads/master@{#392626}
==========

[commit-bot: I haz the power, 2016-05-10 16:45:51]

Patchset 1 (id:??) landed as
https://crrev.com/4f8e71034d840043dcf49bb51e8f911ec284f709
Cr-Commit-Position: refs/heads/master@{#392626}