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This will make it possible to do page discarding from other policies.

Change-Id: I0ddc0d5a2e60a873d8c295b76c0b482427967b7d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2303774Reviewed-by: François Doray <fdoray@chromium.org>
Commit-Queue: Sébastien Marchand <sebmarchand@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789977}