hunterstich 5490b0d91f [Motion] Update MaterialVisibility to not need initialize method
- Add initialization check for secondary animator provider in MaterialVisibility so subclasses no longer need to explicitly call MaterialVisibility#initialize.

PiperOrigin-RevId: 308687877
(cherry picked from commit e63cae59fb71b580399ab7479697b5493f7a9dd1)
2020-05-27 14:52:44 -04:00
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