Merge remote-tracking branch 'goog/mirror-aosp-master' into rvc-dev

* goog/mirror-aosp-master:
  Support checking syntax of generated Blueprint files
  Always emit rules for tests and add phony to run them

Bug: 155628860
Test: treehugger
Change-Id: Ie843b929edf1c11c201792eefcb7772b1e6daeb8