Add assisted dialing logic to Telephony Connections.

Currently, we propogate the assisted dialing property
if we detect that the client requested assisted dialing. This
is because the client is currently responsible for assisted dialing
and only passes along the request if it was successful.

Test: manual
Bug: 35963245
Merged-In: I6897554761b43449b3619747663866ff79b504ec
Change-Id: I122fa1075f70095733368ed19a725f2c820a4f82
(cherry picked from commit 2ae8daaa622cefa0b9e643145b74c75d26430039)
2 files changed