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This enum replaces resource_coordinator::TabManager::DiscardTabCondition.
It can be used by code that doesn't depend on TabManager and/or
that is unrelated to tabs.

TBR=msw@chromium.org

Bug: 775644
Change-Id: I71931a4f32c161bec467e1851d2a68ab843d2d24
Reviewed-on: https://chromium-review.googlesource.com/738298Reviewed-by: François Doray <fdoray@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Commit-Queue: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517419}