GitLab

Change <repeat-button> element to use click event instead of tap,
because when binding to tap event Polymer2 wasn't triggering the click
event.

Change test util functions that issues events to have "composed: true"
[1] when they have "bubbles: true", this allows events to propagate
across shadow DOM boundary.

Add trailing comma to repeat_button.js so auto-formatter leave those
lines expanded.

Update all functions that were updated in test_util_base.js to use
const/let instead of var.

[1] - https://developer.mozilla.org/en-US/docs/Web/API/Event/composed

Bug: 875525
Change-Id: I5890f159ee54a5d6254b90621776cd82ef9bd7b5
Reviewed-on: https://chromium-review.googlesource.com/1237754
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593466}