Document::updateHoverActiveState only cancel hover and active state when hitting native scrollbar

Document::updateHoverActiveState only cancel hover and active state when hitting native scrollbar

This patch is change Document::updateHoverActiveState argument bool hitScrollbar
to Scrollbar hitScrollbar and check hitScrollbar is native scrollbar. This patch
can make `div:hover::-webkit-scrollbar-thumb` working correctly.

BUG=667206
Review-Url: https://codereview.chromium.org/2523903002
Cr-Commit-Position: refs/heads/master@{#434298}
(cherry picked from commit bb7a6b0e1d0b5ca9aab24b7e794dc1d1e81c25db)

Committed: https://chromium.googlesource.com/chromium/src/+/ea3b2748f90de1afbca1477bf39a00642aba1268

[bokan, 2016-12-08 15:39:34]

Description was changed from

==========
Document::updateHoverActiveState only cancel hover and active state when hitting
native scrollbar

This patch is change Document::updateHoverActiveState argument bool hitScrollbar
to Scrollbar hitScrollbar and check hitScrollbar is native scrollbar. This patch
can make `div:hover::-webkit-scrollbar-thumb` working correctly.

BUG=667206

Review-Url: https://codereview.chromium.org/2523903002
Cr-Commit-Position: refs/heads/master@{#434298}
(cherry picked from commit bb7a6b0e1d0b5ca9aab24b7e794dc1d1e81c25db)
==========

to

==========
Document::updateHoverActiveState only cancel hover and active state when hitting
native scrollbar

This patch is change Document::updateHoverActiveState argument bool hitScrollbar
to Scrollbar hitScrollbar and check hitScrollbar is native scrollbar. This patch
can make `div:hover::-webkit-scrollbar-thumb` working correctly.

BUG=667206

Review-Url: https://codereview.chromium.org/2523903002
Cr-Commit-Position: refs/heads/master@{#434298}
(cherry picked from commit bb7a6b0e1d0b5ca9aab24b7e794dc1d1e81c25db)

Committed:
https://chromium.googlesource.com/chromium/src/+/ea3b2748f90de1afbca1477bf39a...
==========

[bokan, 2016-12-08 15:39:35]

Committed patchset #1 (id:1) manually as
ea3b2748f90de1afbca1477bf39a00642aba1268.