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Currently, the ExternalWebAppManager provides a flow for migrating from
an extension-app to a web app specified in a known directory through a
JSON config. This will be used on ChromeOS.

On other platforms, we'll simply hard-code the web app data, and use it
directly. This CL provides an entry point to do so, allowing for the
specification of default apps that are directly included in the binary.

Bug: 809304, 1118195
Change-Id: I0bb83de21ac1f59bdf62fcf313e98db3889bd01f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2417535
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809081}