Only support explicitly approved Settings Slices,
dictated by controllers which return true for the new
method isSliceable.
Updating the supported settings to a whitelist means that
the method to return all available slices must be updated,
and checking slicability when we index slices.
Test: robotests
Bug: 79779103
Change-Id: Ib2b9690cdd0036b5cc4a1cb846c52bce7c824ab9
Add a getter for Slice type for BasePreferenceController.
This facilitates the generation of all possible Slices for Settings
search and discovery for AGSA.
Bug: 62807132
Test: robotests
Change-Id: I2cba1fc72c95769ecc26c76d1f2faa49a285d077
The indexing is done by taking the indexable fragments from
search, grabbing their XML via SearchIndexableResources, and
then looking for controllers defined in preferences.
For each controller found, we take the combination of the
fragment providing the XML and the Preference info to create
an indexable row.
Buiding a Slice will be handled in a subsquent CL, but a
prototype can be found here: ag/3324435
Test: robotests
Bug: 67996923
Change-Id: I48668618079bcc3da55ab77b7323ee8e467073af
