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In ARC, activation of a window is mapped to activity stacking.
Notifications, which are not activities, are always placed at the top
of windows.

When an inline notification and an activity with an input field are
shown at the same time, it causes an issue because regardless of the
activity having focus, the notification always receives keyboard input.

In order to fix that, we have to forward ash side activation through
mojo and reflect it to the NOT_FOCUSABLE flag of notifications.

A Tast test for this will be added.

Android side CL: http://ag/9537575

TEST=manual (Follow the repro steps in the bug.)
BUG=b:142103828

Change-Id: Ifda5532b498ef9ea01ee70836813ae700a6ec58f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1855545Reviewed-by: Greg Kerr <kerrnel@chromium.org>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706235}