tree 6c9b0f13726e5d551378445e61762a057ed82eb4
parent d8a309221cb002ce1c87cedea274b34e38a90207
author Chenjie Yu <cjyu@google.com> 1549329945 -0800
committer Chenjie Yu <cjyu@google.com> 1549475678 -0800

Persist active metrics to disk and read back

For metric activation that spans across boots, we need to persist active
metrics onto disk upon shutdown and load them on boot.

Bug: 123904359
Test: unit test
Change-Id: I5a4142a42595c8c132175fb574c3aa2ad30dcac0