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App banners require several engagement, service worker, and manifest
checks to pass before being displayed. This allows developers to see
in the console the reasons why banners are not displayed, given the
switch --bypass-app-banner-engagement-checks on chrome startup

BUG=458866

Review URL: https://codereview.chromium.org/1129103003

Cr-Commit-Position: refs/heads/master@{#329751}