package_to_container: switch to container.json

We need to look for a file with a different name than "manifest.json"
because the CWS does not let us upload extensions with more than one
(the main one), and we want to support more than one, and we want to
use our own format rather than try to merge with the Chrome API.

BUG=chromium:644347
TEST=creating a new container used container.json

Change-Id: I16de61a8546422688fd7463aed7d5c0ffec6e450
Reviewed-on: https://chromium-review.googlesource.com/506752
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Eric Caruso <ejcaruso@chromium.org>
1 file changed