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Implemented the webui protobuf that will collect information about the database status
as size, update, stores, and more.


Bug: 734667
Change-Id: If920b7c3d90b7e6dfd24c0256b3042900737d7a5
Reviewed-on: https://chromium-review.googlesource.com/578384
Commit-Queue: Kamila Hasanbega <hkamila@google.com>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Reviewed-by: Luke Z <lpz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488694}