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If the web app manifest specifies 'standalone' or 'fullscreen', we do not
show minimal-ui Back and Reload buttons.

We only show the buttons when a web app is being opened in a standalone
window, and the manifest requested 'browser' or 'minimal-ui', or failed to
specify a display mode.

https://w3c.github.io/manifest/#display-modes


Not yet implemented: support for the extensions-based implementation
of bookmark apps - crbug.com/1014346

Bug: 1007151
Change-Id: I68be5280d2d5cfb1ad1565c9408635a694aad2c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1883271
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711141}