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Implements a simple standalone executable which will launch a fullscreen
browsing session and navigate it to a given URL. Similar to
content_shell, but using Web Engine instead.

The flow is kept deliberately simple and linear so it can serve as a
functioning code sample for aspiring embedders of Web Engine.

The shell can be used to test arbitrary static data, which is sourced
from //fuchsia/engine/test/shell_data and hosted under the content URL
fuchsia-dir://shell-data/ .

The shell can also optionally request that the DevTools server be
started at a port specified on the command line.

Bug: 1016485
Change-Id: I09ad56f20553acc83fbf38924fa3e8d8a98a1200
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1869887
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707911}