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Program the NIC to wake-on-packet for packets arriving from
the GCM server.  Chrome notifies the connection manager (shill)
by calling D-Bus methods.  The return status indicates if the
operation succeeded or not (depending on hardware support and
the type of connection).

This is a resubmission of a previous patch with the same title
and functionality containing fixes and a workaround for a problem
that is independent of this patch.  Bug 415821 remains open
for that problem.

Keywords: wowlan, wake-on-lan, wake-on-wlan

BUG=360295
TEST=verified dbus methods are called, and packets are sent on the
TEST=connection passed to the methods.  Also verified that shill
TEST=programs the NIC correctly, and packets wake up the device.

Review URL: https://codereview.chromium.org/597683005

Cr-Commit-Position: refs/heads/master@{#296516}