READ_PHONE_STATE so a push mode service can hold an active
network connection, monitor roaming status, etc. (2) Refresh
push mode status on Refresh(), not just on Check, so UI
(settings) changes, which call refresh(), propagate immediately
to the stores.
BUG=1776149
Automated import of CL 148377
the shipping client will include the necessary generic pieces for
configuring an Exchange client (e.g. account setup) but will not
include actual Exchange client code (e.g. transport / protocol).
Also added a "sample code" implementation of Exchange for use
as a starting point for implementors. (Note, this will not ship
in Donut, it's a placeholder for working on the "framework"
aspects.)
BUG=1740621,1740626
Automated import of CL 144525
