Sean Kinsey 2cfb3f1f8f Enable setting custom styles on scenes stack
Summary: There's scenarios where you might want to retain transparency behind the header, but have a solid background for the scene stack and its transitions.

Reviewed By: ericvicenti, dwwoelfel

Differential Revision: D4471681

fbshipit-source-id: 529e999b96b02a00e8d625169989dda49fb3ddaa
2017-01-26 20:43:33 -08:00
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