DO NOT MERGE - Merge Android 10 into master

Bug: 139893257
Change-Id: I38429ee13989d447b1350d9f098d22786c2e9447
tree: d4d0f1ccfa3d6b82ef0a0be0a353328a3001714d
  1. .gitignore
  2. OWNERS
  3. PREUPLOAD.cfg
  4. library/
  5. tools/