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Currently, this just sends a message with the desktop display
configuration so that it can be added to the client logs.

The display information must be gathered in the Desktop
Process (DesktopSessionAgent) and then IPC'ed over to the
Network Process. A temp hook from the DesktopSessionProxy
to the ClientSession is added since there is no webrtc path
for this message (so it can't follow the normal path from
DesktopSessionProxy -> VideoFrameCapturer -> VideoStream ->
ClientSession).

Change-Id: I0a6b620b3b21aa16e6d978a92ece94f8440dc02c
Reviewed-on: https://chromium-review.googlesource.com/c/1352730Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Joe Downing <joedow@chromium.org>
Commit-Queue: Gary Kacmarcik <garykac@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612405}