change overlay scrollbar hover show to hover fade in

change overlay scrollbar hover show to hover fade in

Currently, we have 2 ways to show the hidden scrollbars:

1. scroll position update
2. move mouse to a region near edge

In this patch, we only change the "move mouse to a region near edge" to
show scrollbars immediately to fade in scrollbars.

BUG=710543
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel

Review-Url: https://codereview.chromium.org/2816923002
Cr-Commit-Position: refs/heads/master@{#466740}
(cherry picked from commit a47e7158e746c01b4ccbbd25d71e267d93347b94)

Review-Url: https://codereview.chromium.org/2843293004 .
Cr-Commit-Position: refs/branch-heads/3071@{#303}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/28eee7a896dd8299e53d555e2232e6422ceb8a5e

[bokan, 2017-04-28 21:15:52]

Description was changed from

==========
change overlay scrollbar hover show to hover fade in

Currently, we have 2 ways to show the hidden scrollbars:

1. scroll position update
2. move mouse to a region near edge

In this patch, we only change the "move mouse to a region near edge" to
show scrollbars immediately to fade in scrollbars.

BUG=710543
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel

Review-Url: https://codereview.chromium.org/2816923002
Cr-Commit-Position: refs/heads/master@{#466740}
(cherry picked from commit a47e7158e746c01b4ccbbd25d71e267d93347b94)
==========

to

==========
change overlay scrollbar hover show to hover fade in

Currently, we have 2 ways to show the hidden scrollbars:

1. scroll position update
2. move mouse to a region near edge

In this patch, we only change the "move mouse to a region near edge" to
show scrollbars immediately to fade in scrollbars.

BUG=710543
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel

Review-Url: https://codereview.chromium.org/2816923002
Cr-Commit-Position: refs/heads/master@{#466740}
(cherry picked from commit a47e7158e746c01b4ccbbd25d71e267d93347b94)

Review-Url: https://codereview.chromium.org/2843293004 .
Cr-Commit-Position: refs/branch-heads/3071@{#303}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/28eee7a896dd8299e53d555e2232...
==========

[bokan, 2017-04-28 21:15:54]

Committed patchset #1 (id:1) manually as
28eee7a896dd8299e53d555e2232e6422ceb8a5e.