Merge mainline-release 6664920 to master - DO NOT MERGE

Merged-In: I4c264d13e086e0ce2afbfc1ddda303846db43b04
Change-Id: Ia2427f7802e3385cc387a757757ff3308cb94fe8
tree: 82eb9e1ffe6e3b0c478f40838544d2937f1dbe40
  1. nn/
  2. .clang-format
  3. CleanSpec.mk
  4. CPPLINT.cfg
  5. OWNERS
  6. PREUPLOAD.cfg