This CL makes the following changes:
1. New public APIs:
- TelecommManager.getCurrentTtyMode: This is used to
get current TTY mode. It's used by Telephony to set
the phone state before calls are created (which is why
it can't be a Conneciton API).
- TelecommConstants.TTY_MODE_*: These are constants
copied from Phone.java
- TelecommConstants.ACTION_CURRENT_TTY_MODE_CHANGED: This
action is fired when the current TTY mode changes.
Apps can listen to this before and during a call.
The old version of this was in TtyIntent.java which
I deleted.
2. New private API
- TelecommManager.isTtySupported: This is used by
Telephony to hide the TTY settings on devices
that don't support TTY
3. Various updates to use the constants renamed in this CL
Change-Id: I652b095af30cc2732a06829dc23492e5355660da
001bbbb239