Add launchIntent method to App Controller service.

New method allows KioskNextHome to launch ARC intents. The intents will
be checked via IntentConfigHelper which parses and enforces the config
from a JSON resource file.

Bug: 927809
Change-Id: Ibfd8b4ec5a2010c5a8b39b3cad4cd1bd97aa8cdd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1570426
Commit-Queue: Bruno Santos <brunoad@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654121}
12 files changed