The two arrays need to have the same length and the selection
must match in their nullness (unless for TYPE_NONE
renderers). Clarify this more clearly in the docs and add
new asssertions for it. This avoids that the player is failing
in obscure ways much later.
Issue: androidx/media#1473
#cherrypick
PiperOrigin-RevId: 646086833
(cherry picked from commit 71ef848ec3fa4409f3cdf797226c2a51ecd15da6)
f49fa99aab