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This refactor was done to allow for greater granularity for internal LifecycleUnit state representation.

Change-Id: I27c20eec8e5fe7f1365b64fe87b32cfdf124fbb8
Reviewed-on: https://chromium-review.googlesource.com/1041010
Commit-Queue: Varun Mohan <varunmohan@google.com>
Reviewed-by: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556109}