These templates are currently in the MR extension. We will need to migrate them into Chromium in order to remove the dependency on <extensionview>.
Modifications will be necessary to replace the Presentation API (or Cast SDK for Cast template) logic for commands with standardized commands sent via MediaRouterUI.
This work is not necessarily blocked by having the media controller API / implementation available in MR, as we can stub out the calls in MediaRouterUI.
Comment 1 by imch...@chromium.org
, Jan 24 2017