[automerger skipped] Export libtextclassifier and make some native tests working again am: a06bdc71ed am: 31806f2a8b -s ours am: 30fbb4bf91 -s ours

am skip reason: Change-Id I98b25793e9644bee43f416255911d969b31d91b7 with SHA-1 a06bdc71ed is in history

Change-Id: I8d59d1adb5dcb010602b05f7456df2336172e86a