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This CL enforces that a tab is frozen prior to being proactively discarded. This will allow the website to have enough time to persist any state prior to being proactively discarded. Urgent discard behavior is unchanged.

Bug: 775644
Change-Id: Ia3ec9e8f53f80d2c940edd065090415cbcdd1f6c
Reviewed-on: https://chromium-review.googlesource.com/1041138
Commit-Queue: François Doray <fdoray@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Reviewed-by: Pavel Yatsuk <pavely@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557209}