Pass attributes to the default canvas in new Ember versions #473

Job	Run time
Tests	1m 2s
Floating Dependencies	52s
Build Tests	1m 52s
Scenario: ember-lts-3.28 \| optional: false	2m 2s
Scenario: ember-lts-4.4 \| optional: false	2m 31s
Scenario: ember-release \| optional: false	2m 4s
Scenario: ember-beta \| optional: false	2m 10s
Scenario: ember-classic \| optional: false	2m 13s
Scenario: ember-canary \| optional: true	2m 19s
Scenario: embroider-safe \| optional: true	2m 19s
Scenario: embroider-optimized \| optional: true	2m 30s
	21m 54s

Provide feedback