Add adapt_scan experimental flag
Add adapt_scan experimental flag

Change-Id: I1424690fa792b960a1cfb78bbcb37da6b9899ee6

GrokImageCompression/aom,smarter/aom,mbebenita/aom,mbebenita/aom,luctrudeau/aom,luctrudeau/aom,GrokImageCompression/aom,GrokImageCompression/aom,smarter/aom,luctrudeau/aom,mbebenita/aom,smarter/aom,luctrudeau/aom,luctrudeau/aom,luctrudeau/aom,GrokImageCompression/aom,mbebenita/aom,GrokImageCompression/aom,mbebenita/aom,mbebenita/aom,smarter/aom,smarter/aom,mbebenita/aom,smarter/aom,mbebenita/aom,mbebenita/aom,GrokImageCompression/aom