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This CL adds logic to dismiss the heavy page capping InfoBar after 8
seconds of no requests being finished on the page. The actual time is
field trial configurable. This also adds a browser test to check this
behavior.

Bug: 888817
Change-Id: I7332918b4590f2f8cd70db365af8dce60f26956c
Reviewed-on: https://chromium-review.googlesource.com/1242173Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Ryan Sturm <ryansturm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594831}