bachinger fc1089f68a Migrate media constants from androidx.media.util.MediaConstants
Adds root extras and metadata extras to MockMediaLibraryService and MockMediaBrowserCompatService and completed test cases for asserting
interoperability with a media1 or Media3 browser.

PiperOrigin-RevId: 480854842
(cherry picked from commit 006a519a0e83d5b9e4262a5bbc228c02b3c9cf5f)
2022-10-13 11:18:46 +00:00
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