DO NOT MERGE - Merge Android 10 into master

Bug: 139893257
Change-Id: I67a7040a90c369abf5a0c3e7cf0e16f351addb99
tree: 6a561f5379c73c4eb7ba64915284437755028320
  1. .gitignore
  2. README
  3. apps/
  4. build/
  5. util/