Increase delay for aggregating events after a single gesture in spark-menu-button
Special `template if="{{...}}"` within <option> tag didn't work

Better to have dart2js warnings than not working code...
Merge pull request #2107 from ussuri/new-project-templates

Special `template if="{{...}}"` within <option> tag didn't work
Merge pull request #2106 from ussuri/move-menu-back-to-spark_polymer_ui

Increase delay for aggregating events after a single gesture in spark-menu-button
Merge remote-tracking branch 'upstream/master' into new-ui-button