Views (native UI) overlay scrollbars: match blink overlay scrollbar

Views (native UI) overlay scrollbars: match blink overlay scrollbar
behavior by not showing the scrollbar on hover.

We do, however, keep the scrollbar visible if it's already visible and
then hovered.

BUG=669810
Committed: https://crrev.com/b9232bb95ce16908bb79ed86257b89aa9e2ab4a2
Cr-Commit-Position: refs/heads/master@{#437023}

[Evan Stade, 2016-12-07 02:41:29]

estade@chromium.org changed reviewers:
+ sadrul@chromium.org

[Evan Stade, 2016-12-07 02:41:34]

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

[commit-bot: I haz the power, 2016-12-07 02:42:07]

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, 2016-12-07 03:36:12]

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

[commit-bot: I haz the power, 2016-12-07 03:36:13]

Dry run: This issue passed the CQ dry run.

[sadrul, 2016-12-07 17:38:48]

lgtm

[Evan Stade, 2016-12-07 18:55:04]

The CQ bit was checked by estade@chromium.org

[commit-bot: I haz the power, 2016-12-07 18:55:45]

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, 2016-12-07 19:03:29]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1481136904738380, "parent_rev":
"f82efa481c4dc67627b794a3ec5c3c5d7c28a30b", "commit_rev":
"cc472498f44fe3f1e005057dca5fa8c2469dea90"}

[commit-bot: I haz the power, 2016-12-07 19:04:03]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-12-07 19:06:33]

Description was changed from

==========
Views (native UI) overlay scrollbars: match blink overlay scrollbar
behavior by not showing the scrollbar on hover.

We do, however, keep the scrollbar visible if it's already visible and
then hovered.

BUG=669810
==========

to

==========
Views (native UI) overlay scrollbars: match blink overlay scrollbar
behavior by not showing the scrollbar on hover.

We do, however, keep the scrollbar visible if it's already visible and
then hovered.

BUG=669810

Committed: https://crrev.com/b9232bb95ce16908bb79ed86257b89aa9e2ab4a2
Cr-Commit-Position: refs/heads/master@{#437023}
==========

[commit-bot: I haz the power, 2016-12-07 19:06:33]

Patchset 1 (id:??) landed as
https://crrev.com/b9232bb95ce16908bb79ed86257b89aa9e2ab4a2
Cr-Commit-Position: refs/heads/master@{#437023}