This change addresses the following API council feedback.
- Remove all constants from TvContentRating. Instead this class becomes a
general parser for a tuple of "rating domain"+type+subtype(s).
- Instead of constants in the API, the rating definitions should come from
parsed XML meta-data tied to a TvInputService entry in the AndroidManifest.
This XML should define a ranked order of the rating constants along with
@string references for displaying in the Settings UI. Mention that the
"rating domain" should be scoped similar to a package name, for example
"com.youtube.ratings".
- For system-defined rating types (like US, Korea, etc) we should parse this
same XML format, but it may come from a hard-coded XML resource (since they
aren't tied to a single TvInputService.)
- Thoroughly document the built-in supported types in javadoc on TvContentRating.
Change-Id: I0a9526c73c8ca67fd0eeac63f3c63c05657a45e3
5c5b83fcd5