Make some type conversions explicit
Make some type conversions explicit

Change-Id: I35e1126e567a949267898bb0fc95c518db98999a

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