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Previously, "zero" was used as the last active time for tabs open in
the background, which made them immediately eligible for proactive
freeze and discard. With this CL, their creation time is used as the
last active time, which will prevent them from being proactively frozen
or discarded for at least 10 minutes after creation (note: except
when the number of tabs is considered excessive, see
tab_manager_features.cc).

Bug: 854272
Change-Id: I5398b24fadbd073bd224e2a9e98c8ae610b26e92
Reviewed-on: https://chromium-review.googlesource.com/1106612Reviewed-by: Sébastien Marchand <sebmarchand@chromium.org>
Commit-Queue: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568574}