Ensured that all players have the same size

Previously, Media players could have different sizes
if for example their album art was gone. We now enforce
that all of them have the same size, determined by
the max of their wrap_content heights.

Fixes: 159864229
Test: add a player without album art, e.g. a resumable player. Observe consistent measurements with others
Change-Id: Iaacb2b78b7d92ed21e382d69b3bf599dbd7b1a6e