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A frozen LifecycleUnit can't use the CPU.

Note: This feature will  be test by a browser test in
https://chromium-review.googlesource.com/c/chromium/src/+/980742/5/chrome/browser/resource_coordinator/tab_manager_browsertest.cc#814

Bug: 775644
Change-Id: I5b5aac616e7a5d28b61f379d841da2b75420300d
Reviewed-on: https://chromium-review.googlesource.com/981396
Commit-Queue: François Doray <fdoray@chromium.org>
Reviewed-by: Sébastien Marchand <sebmarchand@chromium.org>
Reviewed-by: Fadi Meawad <fmeawad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547714}