add missing protobuf def file
add missing protobuf def file

LongbinChen/annoy,LongbinChen/annoy,Houzz/annoy2,Houzz/annoy2,LongbinChen/annoy2,LongbinChen/annoy2,LongbinChen/annoy2,Houzz/annoy2,LongbinChen/annoy