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Note that --enable-features=MediaApp and the added test still work even
when gn args has enable_cros_media_app = false, but the mock app is
loaded in this case (i.e. js/app_main.js is an empty file).

The manifest and html served are the same regardless of enable_cros_media_app.

Bug: 996088
Change-Id: I4b81f622efc874afdc53794eede8d04b69e3e3ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1824523Reviewed-by: calamity <calamity@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705746}