In WifiDialogActivity, handle the case where the given
accessPointState is null, and show the Wi-Fi dialog allowing users
to enter the SSID and other credentials. This will be used by setup
wizard when user selected "Add new network" item.
Bug: 23392285
Change-Id: Ica2650d9e829d73281bc9c504c3005d9c5750d31
Add a Wi-Fi dialog activity that can be started by setup wizard to
connect to a Wi-Fi access point.
Also refactored mEdit and mModify in WifiConfigController into an
int-enum mMode, with modes view, connect and modify. This is how the
new modes maps to the old flags:
MODE_VIEW -- mEdit = false, mModify = *
MODE_CONNECT -- mEdit = true, mModify = false
MODE_MODIFY -- mEdit = true, mModify = true
Bug: 23426311
Change-Id: I8e2221fd3c42577068e07686dab245dd5888e0ae
