tree 24f47328f8181a0b603e1b639a657ac5faa42eec
parent 81d247d746299f2f0e576945105c2ff5809a1887
author Howard Hao <hhhao@google.com> 1624314509 -0700
committer Howard Hao <hhhao@google.com> 1625002414 -0700

Add system monitor event class, set DataBroker priority when receives
event.

- The SystemMonitorEvent contains system status
- DataBrokerController uses the event to determine the appropriate task
priority to run for DataBroker

Bug: 187744195
Test: atest CarServiceUnitTest:DataBrokerControllerUnitTest
Test: atest CarServiceUnitTest:SystemMonitorEventUnitTest
Change-Id: I18087dc3f44e26000932afd3110f0ee6c5a38482