Build native FileObserver for host.

Test: ctesque/run_tests_host.sh
Test: ctesque/run_cts_tests_host.sh

Change-Id: Idfcee3edc08e5c98aa670cf45db7c5bb2f461593
(cherry picked from commit 0ccc1ce74ca5108c315cfa48846957c51a754a70)
2 files changed