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In NotificationViewMD, the inline reply field will be shown when
a configured button in a notification is clicked.

The intended behavior is to focus on inline reply after the button
is clicked, but RequestFocus was called before SetVisible(true),
which is no-op.

You can test the feature by enabling
chrome://flags/#enable-experimental-web-platform-features then
https://tests.peter.sh/notification-generator/ ->
Actions -> "One action (type text)" -> Display the notification.

TEST=NotificationViewMDTest.TestInlineReply
BUG=845189

Change-Id: I1f5d80ad1ab20b7061621fdc6ab8745c7c4ecfea
Reviewed-on: https://chromium-review.googlesource.com/1068529
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560919}