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CL adds the SQLite database backend implementation to support recording
first-party contexts in which client-side storage APIs are accessed.

The database is not currently instanstiated or accessible from
production code.

Bug: 1083384
Change-Id: I0fa83b09c11c988364957ef58d25b51eae0a16ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2218072Reviewed-by: Martin Šrámek <msramek@chromium.org>
Commit-Queue: Theodore Olsauskas-Warren <sauski@google.com>
Cr-Commit-Position: refs/heads/master@{#774044}