GitLab

- Implemented proto_conversion for query_tile_entry.
- Added unit test for proto_conversion and query_tile_store.
- Fixed some lint/nits.

Bug: 1060805c
Change-Id: Ife1245aa6749ad2e534351c8b66a7e819adf1d75
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2103656
Commit-Queue: Hesen Zhang <hesen@chromium.org>
Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#750880}