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Add chrome://flags entry to allow pages controlled by a Service
Worker to be put into back-forward.

This support is highly experimental, so please use with care.

In order to make this possible, BackForwardCacheWithServiceWorker
feature is replaced with a parameter on BackForwardCache parameter.

R=arthursonzogni@chromium.org

Change-Id: I741aefed9a54f87a4c6ece2003be0e8664ddd470
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1807328
Commit-Queue: Alexander Timin <altimin@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697335}