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This will be used by the freezing policy to freeze pages.

Bug: 1144025
Change-Id: Ica001f0f3f5288200f1c082cc48e9a3019be9368
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2584605
Commit-Queue: Sébastien Marchand <sebmarchand@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835982}