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Takes into account the display_override manifest value when
determining if the PWA is installable.

For example, if the developer specifies:
  display: "browser"
  display_override: ["standalone"]

This should be installable, but prior to this change, chromium
would only evaluate the display property.

Since unsupported values are ignored when parsing the manifest,
only the first value in the parsed display_override array needs
to be evaluated.

To test the change use: chrome --enable-features=WebAppManifestDisplayOverride
Example websites:
 - (not installable) https://mwjacksonmsft.github.io/pwa/display-override-browser/index.html
 - (installable) https://mwjacksonmsft.github.io/pwa/display-override-custom/index.html

Explainer: https://github.com/WICG/display-override/blob/master/explainer.m
Design document: https://docs.google.com/document/d/1hEmbGVHMN38q1YTaaGccQ-Y5CHr7xIURYPRWXTuvZLo/edit?usp=sharing
I2P: https://groups.google.com/a/chromium.org/d/topic/blink-dev/WvIeZT8uSzw/discussion

Bug: 1109520
Change-Id: Ib3f7465ed36474b1166f136c3cd6655cc34add0e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2333541
Commit-Queue: Mike Jackson <mjackson@microsoft.com>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796899}