This has been discussed in an email thread. This brings the
text to speech API in line with other android APIs.
The user can set default speech rates / languages and
engine preferences, which the API obeys BUT these can be
overriden by individual apps (much like intent.setComponent
and intent.setClassName can be used to launch a specific
handler for a given intent).
Also, all installed engines are enabled by default. The
user is shown the "data privacy" warning every time an
installed engine is set to the default.
Change-Id: I24f5f331b3a7cc7ce1a62962192e3a452bdca9d4
c3edf2a01a