Android R Preview 4 (RPP4.200409.015)
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DO NOT MERGE - qt-qpr1-dev-plus-aosp-without-vendor@5915889 into stage-aosp-master
am: e6b849a6b9

Change-Id: If74e9d0ff6820cf1476071b93fd9fdcd02847e38
tree: 6a561f5379c73c4eb7ba64915284437755028320
  1. .gitignore
  2. README
  3. apps/
  4. build/
  5. util/