samrobinson cd6c2e989f Change MediaMetadata update priority to favour MediaItem values.
The static and dynamic metadata now build up in a list, such that when
the MediaMetadata is built, they are applied in an event order. This
means that newer/fresher values will overwrite older ones. The MediaItem
values are then applied at the end, as they take priority over any other.

#minor-release

PiperOrigin-RevId: 405383177
2021-10-25 15:16:16 +01:00
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