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External loader that loads extension CRXs from the offline demo
resources image mounted by the image loader service.

It expects that offline demo resources, in addition to actual CRX files
to install, a JSON that maps bundled app IDs to the CRX location and
app version (in the same format as for other external extensions, e.g.
default Chrome OS apps).

Bug: 863162

Change-Id: I88aa544be10d74c1ead10a685bb7fd238f18cdd0
Reviewed-on: https://chromium-review.googlesource.com/1134579Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Commit-Queue: Toni Barzic <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577648}