Add field trial config for TabStateFlatBuffer

Was reverted because of b:340580707. Now that is fixed,
re-adding the config.

Bug: b:334620540, b:340580707
Change-Id: Ic9f878403d5ee24efff5675ac4c0d9e53601af8d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5538993


Reviewed-by: Calder Kitagawa <ckitagawa@chromium.org>
Commit-Queue: David Maunder <davidjm@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1300864}