[automerger skipped] Export libtextclassifier and make some native tests working again am: a06bdc71ed am: 31806f2a8b am: 00a6c4b10c -s ours

am skip reason: Change-Id I98b25793e9644bee43f416255911d969b31d91b7 with SHA-1 d4b52f3f0d is in history

Change-Id: Icec5fed5213b802876847515f78bf50ea188dd6e