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This is the initial simple implementation of proactive tab discarding. This will be ran on a Finch trial with various parameters in order to find balance between maximal resource savings and minimal impact to user experience.

Bug: 775644
Change-Id: If5048f622bd24d540804842c7e5448c48fabad36
Reviewed-on: https://chromium-review.googlesource.com/1014646
Commit-Queue: François Doray <fdoray@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553558}