Stop notification updates from unpausing toast timers.

Stop notification updates from unpausing toast timers.

Notification toast timers are paused when the notification gains
focus. If a notification is updated while it is paused, then previously,
its timer would be unpaused. So, it would disappear while being focused.

BUG=710298
Review-Url: https://codereview.chromium.org/2810723004
Cr-Commit-Position: refs/heads/master@{#463943}
(cherry picked from commit c556f5a3a662c0b79ae7961f8bdbfaf2cc4236fb)

Review-Url: https://codereview.chromium.org/2815093006 .
Cr-Commit-Position: refs/branch-heads/3029@{#708}
Cr-Branched-From: 939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed: https://chromium.googlesource.com/chromium/src/+/0f41f7a2f609c86c39fce1c92b1e4f0438e447ff

[yhanada, 2017-04-14 04:37:36]

Description was changed from

==========
Stop notification updates from unpausing toast timers.

Notification toast timers are paused when the notification gains
focus. If a notification is updated while it is paused, then previously,
its timer would be unpaused. So, it would disappear while being focused.

BUG=710298

Review-Url: https://codereview.chromium.org/2810723004
Cr-Commit-Position: refs/heads/master@{#463943}
(cherry picked from commit c556f5a3a662c0b79ae7961f8bdbfaf2cc4236fb)
==========

to

==========
Stop notification updates from unpausing toast timers.

Notification toast timers are paused when the notification gains
focus. If a notification is updated while it is paused, then previously,
its timer would be unpaused. So, it would disappear while being focused.

BUG=710298

Review-Url: https://codereview.chromium.org/2810723004
Cr-Commit-Position: refs/heads/master@{#463943}
(cherry picked from commit c556f5a3a662c0b79ae7961f8bdbfaf2cc4236fb)

Review-Url: https://codereview.chromium.org/2815093006 .
Cr-Commit-Position: refs/branch-heads/3029@{#708}
Cr-Branched-From:
939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed:
https://chromium.googlesource.com/chromium/src/+/0f41f7a2f609c86c39fce1c92b1e...
==========

[yhanada, 2017-04-14 04:37:39]

Committed patchset #1 (id:1) manually as
0f41f7a2f609c86c39fce1c92b1e4f0438e447ff.