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Currently the process binding strength of the page in back-forward cache
is same as foreground page.

We want to set the process binding strength of the page once it enters the
back-forward cache to the same level as background tabs to ensure that the OS
can kill a process with bfcached page instead of the process with foreground
page.

Bug: 998608

Here is the document explaining more details:
https://docs.google.com/document/d/12xiw5jqR7A_cvpDYPoX1dyv0XyMPJJVh1uEHZRyE8TE/edit?usp=sharing

Change-Id: I6dd9fbaf90b6640c602734784dc5c51338a115a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1893067
Commit-Queue: Sreeja Kamishetty <sreejakshetty@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Carlos Caballero <carlscab@google.com>
Cr-Commit-Position: refs/heads/master@{#721848}