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This CL allows us to inject local state to LocalSearchService.

Design doc: go/lss-sandboxing
Implementation plan: go/lss-sandboxing-impl

Bug: 1137560
Change-Id: I83dbdeb1e1161393b6408866a99b8ddce1c43530
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2560283
Commit-Queue: Thanh Nguyen <thanhdng@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Jia Meng <jiameng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832653}