Merge cherrypicks of ['ag/20615113'] into security-aosp-qt-release.

Change-Id: I1aa6605be236783392227f244265b82bc7786a40
tree: 1817a8bba7557b12f95cf7f5cc65b059c92e07d3
  1. nn/
  2. .clang-format
  3. CleanSpec.mk
  4. OWNERS
  5. PREUPLOAD.cfg