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This new property will be important for Infobars whose actions
will take some time and require the banner persisting to visualize
that process.

This change also adds InfobarTranslateCoordinator as implementing
InfobarCoordinatorImplementation.

Bug: 1014959
Change-Id: Iaa21fd9f3025e9797f9d0b63f6337efd0e3cb89a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1899635
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713300}