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Add support for sentinel tuning version that is used for "control" optimizations where the type should be disabled for the navigation

Bug: 1113287
Change-Id: Id82122c8f2918300bedc151b93b58d5aa9abb1ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2357558
Commit-Queue: Sophie Chang <sophiechang@chromium.org>
Reviewed-by: Michael Crouse <mcrouse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798802}