gaaclarke 90cea20d09 fixes mask blurs on stoked gradient geometry (flutter/engine#55717)
fixes https://github.com/flutter/flutter/issues/155930

This starts taking into account the translation of the entity that is
snapshotted when performing the gaussian blur. I'm uncertain under what
conditions, but sometimes the snapshot logic would need this offset. The
linked issue and added tests demonstrate those cases.

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