When developer options switch is off, a user including guest user
can still configure media transcoding settings via slices.
Bug: 244569778
Test: manual
Change-Id: I3d70045c2498e683bf615cbe521e2f98d50b7eec
If the user enables this, then that means that we will respect user's
choices for all the preferences, i.e. we will not update the preferences
based on the updates from server.
On the other hand, if it's disabled, then the rest of the preferences
would not be considered. And we'd decide their values based on the
values from the DeviceConfig (which in turn come from the server).
The controller for the default-transcoding-behavior for apps was also
added.
Also, renaming the set prop key for enabling-transcode to match the one
in DeviceConfig - transcode_enabled.
And while we were at it, we renamed the stirng from "disabling
transcoding for all apps" to "enabling transcoding for all apps"; and
also changed the controller to enable (instead of disable) transcoding.
BUG:169327180
Test: manual testing. And added unit test for
TranscodeUserControlPreferenceControllerTest.
Change-Id: If9b9face51b669f5177be8bfa18f44471f531058