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This change implements presenting InfobarBannerViewController when
InfobarTranslateCoordinator starts and the button action. Some constants
from TranslateInfobarController are moved to a constants so that they
can be shared.

Screenshot of what it will look like when activated: https://drive.google.com/open?id=11W6HznODlJduMCZgNOSR1b8Gi_crfQl0

Bug: 1014959
Change-Id: I4e5e2859d20e3f04cd477f65e23889d2aa5b37e3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872013
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Reviewed-by: Peter Lee <pkl@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708878}