chromium: Do the activation explicitly

chromium: Do the activation explicitly

Now chromium should use changes from the agl-shell v3 protocol to track
app state changes and activate the applications instead of letting the
compositor handle it.

This change disables default activation by the compositor and lets
chromium handle application activation.

Depends on https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/28371
that adds the new config file with landscape orientation and
disabled default activation.

Bug-AGL: SPEC-4647, SPEC-4528

Signed-off-by: Roger Zanoni <rzanoni@igalia.com>
Change-Id: Ifbcb447b153408db01f592818288efbd5c940f67