Propagate user private data when film grain enabled.
Propagate user private data when film grain enabled.

BUG=aomedia:2163

Change-Id: Ib8e059347d630fd97c4ed7e345a71d74281eedde

GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom