GitLab

This CL implements InvertedIndexSearch functions that are inherited
from new Index interface.

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

Bug: 1137560
Change-Id: I3a1439f9b43d9d52bbb6819308535aa28ef7fe3d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2531078Reviewed-by: Jia Meng <jiameng@chromium.org>
Commit-Queue: Thanh Nguyen <thanhdng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827660}