Android 9.0.0 release 40
Update build-tools to ab/4629474 am: ec4e9f97f5 am: d2d2929607
am: e74215a80b

Change-Id: Ifdf2a5c7d0697d0ec77c551974c7fc5263b65462
tree: f4d60a56b64ae1d37a778dea377c508c8d80ee2c
  1. common/
  2. darwin-x86/
  3. linux-x86/
  4. build-prebuilts.sh
  5. manifest.xml
  6. OWNERS