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X11 applications have two common ways of bringing their windows to the
user's attention: sending NET_ACTIVE_WINDOW and setting the urgency
flag in NET_WM_HINTS. These tricks are used by applications to, e.g.
refocus their windows when the user opens a file in an already-running
app.

In crrev.com/c/1824398 we add support to sommelier to identify these
requests. We must now add a method to the aura protocol so that we can
communicate the request to chrome.  For the time being the request will
do nothing, as we are awaiting UX input on how to respond to the
request.

Bug: 899587
Change-Id: I0e8b6e639a389055b6e2adbaeb77d0881dd2c18d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1824726
Commit-Queue: Nic Hollingum <hollingum@google.com>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Fergus Dall <sidereal@google.com>
Cr-Commit-Position: refs/heads/master@{#704054}