Merge cherrypicks of ['googleplex-android-review.googlesource.com/26517533'] into security-aosp-sc-v2-release.

Change-Id: Idb5e4d593ddcd93f732f2518e128c3bdd5f28d37
tree: 89d7669acff4cf4ca65c74b830f0cd29fe3d0bd9
  1. base/
  2. benchmarks/
  3. fuzzer/
  4. include/
  5. tests/
  6. Android.bp
  7. EventFlag.cpp
  8. FmqInternal.cpp
  9. OWNERS
  10. PREUPLOAD.cfg
  11. TEST_MAPPING