Make notification high priority While download is in progress

Make notification high priority While download is in progress

Android only show action buttons when notification is on top
of the notification drawer.
By setting priority to high, we move the download progress
notification to the top drawer.
As a result, user can see the action buttons and pause/cancel the active
download.

This UI change is per discussion with rolfe@ and sidv@.

TBR=dtrainor@chromium.org
BUG=603229
Review URL: https://codereview.chromium.org/1889443003

Cr-Commit-Position: refs/heads/master@{#387674}
(cherry picked from commit 9b87ece5135008a0a046a7b2edf4436d60183144)

Committed: https://chromium.googlesource.com/chromium/src/+/d47b3994afdddf2e3d40f510b8c56935c3fcd5ce

[qinmin, 2016-04-15 21:32:06]

Description was changed from

==========
Make notification high priority While download is in progress

Android only show action buttons when notification is on top
of the notification drawer.
By setting priority to high, we move the download progress
notification to the top drawer.
As a result, user can see the action buttons and pause/cancel the active
download.

This UI change is per discussion with rolfe@ and sidv@.

TBR=dtrainor@chromium.org
BUG=603229

Review URL: https://codereview.chromium.org/1889443003

Cr-Commit-Position: refs/heads/master@{#387674}
(cherry picked from commit 9b87ece5135008a0a046a7b2edf4436d60183144)
==========

to

==========
Make notification high priority While download is in progress

Android only show action buttons when notification is on top
of the notification drawer.
By setting priority to high, we move the download progress
notification to the top drawer.
As a result, user can see the action buttons and pause/cancel the active
download.

This UI change is per discussion with rolfe@ and sidv@.

TBR=dtrainor@chromium.org
BUG=603229

Review URL: https://codereview.chromium.org/1889443003

Cr-Commit-Position: refs/heads/master@{#387674}
(cherry picked from commit 9b87ece5135008a0a046a7b2edf4436d60183144)

Committed:
https://chromium.googlesource.com/chromium/src/+/d47b3994afdddf2e3d40f510b8c5...
==========

[qinmin, 2016-04-15 21:32:07]

Committed patchset #1 (id:1) manually as
d47b3994afdddf2e3d40f510b8c56935c3fcd5ce (presubmit successful).