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This adds a NavigationsAreFullyCommitted test which checks that the
BFCache code is actually committing navigations, and isn't just swapping
in the frame without committing.

This CL also defines a separate PageWithDedicatedWorkerNotCached test
which focuses on a single disallowed feature.  We expect to have many
more tests like this, (one per disallowed feature).

Change-Id: I5a4c17cd19698cc21dfcaa8dcd7c1d31eecf135d
Bug: 976697
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1702021
Commit-Queue: Lowell Manners <lowell@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682200}