Request queue implementation plan:
1. Land the interfaces
2. Land implementation of the Queue with tests
3. Land basic implementation of the store (one entry, no persistence) with tests
4. Land implementation of policy for AddRequest with tests
5. Land implementation of policy for purging with tests
6. Land proper implementation of the store (using SQLite) with tests
Comment 1 by fgor...@chromium.org
, Apr 27 2016