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Since the AppBannerManager may miss loading (its usual trigger) if
loaded in a portal context, also observe portal activation into a tab
and trigger the same logic at that point.

Android instrumentation test included.

Fixed: 1087163
Change-Id: I9e8a888f6f5ce2d3d13d825f62d64d0d164bfc55
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2219041Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Kevin McNee <mcnee@chromium.org>
Commit-Queue: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773233}