Support silently running subprocesses.

This will cut down on the log spam from things like running --helpxml to
deduce the flags of subprocesses.

Test: Used in later CL
Change-Id: I1642dcbcc3e1535da5c2dca39b9b2e29a3e67481
2 files changed
tree: 732f90051d0c81887045f44e245f810457528929
  1. common/
  2. guest/
  3. host/
  4. tests/
  5. tools/
  6. Android.bp
  7. Android.mk
  8. OWNERS
  9. TEST_MAPPING