
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)
Session test common module
Provides common components for use by session tests.