
gr-reply-dialog_test.html fails when dom=shadow in Safari due to a race condition. Polymer lazily performs local DOM mutations in some cases for performance (in this case, the two calls to MockInteractions.tap() were the culprit). flush() ensures that asynchronous changes have taken place. Bug: Issue 4573 Change-Id: I5a97ddcc7dd17933f763c4ef58235a0fdd8f5269