Merge 75a4345c46e122a02f028fbe5c86e78fa6e2f11f on remote branch

Change-Id: I23959d4681f4514defaf535b4f28484272a33dc3
tree: e670787d3ce5016bef9198ab79a97a25a0620403
  1. nn/
  2. .clang-format
  3. CleanSpec.mk
  4. CPPLINT.cfg
  5. OWNERS
  6. PREUPLOAD.cfg