Re-land fix display of wheel event listeners on a page.

Re-land fix display of wheel event listeners on a page.

Fields were getting duplicated for scrollbars. Mark the entire
inner viewport as blocked on scroll if we have a wheel listener
we don't need to iterate the tree.

This was reverted in https://codereview.chromium.org/1816723003 because
the sheriff thought it caused a build failure; but the actual failure was
from merge of https://chromium.googlesource.com/chromium/src/+/58cef5be289f5004932682c17694aaa7724bae70
and subsequent fix https://chromium.googlesource.com/chromium/src/+/98aba017dee34d0c08df009095e1fe7bbd6acb49

BUG=595591
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
TBR=aelias@chromium.org

Committed: https://crrev.com/1936b3f6dcdd44c9a7db4e1686437568a7dd1aad
Cr-Commit-Position: refs/heads/master@{#382295}

[dtapuska, 2016-03-21 14:54:02]

The CQ bit was checked by dtapuska@chromium.org

[commit-bot: I haz the power, 2016-03-21 14:54:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1816083002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1816083002/1

[commit-bot: I haz the power, 2016-03-21 15:45:53]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-21 15:46:46]

Description was changed from

==========
Re-land fix display of wheel event listeners on a page.

Fields were getting duplicated for scrollbars. Mark the entire
inner viewport as blocked on scroll if we have a wheel listener
we don't need to iterate the tree.

This was reverted in https://codereview.chromium.org/1816723003 because
the sheriff thought it caused a build failure; but the actual failure was
from merge of
https://chromium.googlesource.com/chromium/src/+/58cef5be289f5004932682c17694...
and subsequent fix
https://chromium.googlesource.com/chromium/src/+/98aba017dee34d0c08df009095e1...

BUG=595591
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
TBR=aelias@chromium.org
==========

to

==========
Re-land fix display of wheel event listeners on a page.

Fields were getting duplicated for scrollbars. Mark the entire
inner viewport as blocked on scroll if we have a wheel listener
we don't need to iterate the tree.

This was reverted in https://codereview.chromium.org/1816723003 because
the sheriff thought it caused a build failure; but the actual failure was
from merge of
https://chromium.googlesource.com/chromium/src/+/58cef5be289f5004932682c17694...
and subsequent fix
https://chromium.googlesource.com/chromium/src/+/98aba017dee34d0c08df009095e1...

BUG=595591
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
TBR=aelias@chromium.org

Committed: https://crrev.com/1936b3f6dcdd44c9a7db4e1686437568a7dd1aad
Cr-Commit-Position: refs/heads/master@{#382295}
==========

[commit-bot: I haz the power, 2016-03-21 15:46:47]

Patchset 1 (id:??) landed as
https://crrev.com/1936b3f6dcdd44c9a7db4e1686437568a7dd1aad
Cr-Commit-Position: refs/heads/master@{#382295}