Throttle wifi scan requests from background apps (2/2).

Background apps cannot start wifi scans more frequent than once every 30
minutes.

Bug: 37320631

Test: Manual test. Unit tests with runtest.sh.
Change-Id: I4473dbfa6a9efcb889cca78ed77ff483174be276
2 files changed
tree: c264316e65af89917092d2532df0019d2a820b00
  1. service/
  2. PREUPLOAD.cfg