/usr/share/upstart/sessions/application.conf is in ubuntu-app-launch 0.5+15.10.20150817-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | description "Application Launching Wrapper"
author "Ted Gould <ted@canonical.com>"
start on application-start
task
# Events aren't emitted directly, but start is used to create them
emits application-legacy-start
emits application-click-start
env APP_ID
export APP_ID
env APP_URIS
export APP_URIS
exec /usr/lib/x86_64-linux-gnu/ubuntu-app-launch/application-job
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