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When a desktop PWA is launched in a window, we now record the
display mode that was requested in the manifest.




Bug: 1939127
Change-Id: I98b77e5eebd355add3cb38a97924fbcd457b99fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1939082
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719853}