GitLab

This is an initial implementation of AbortPaymentEvent in WebIDL level.

Related spec change:
  https://github.com/w3c/payment-handler/pull/170

Bug: 736745
Change-Id: I5cdf6b8e6a8019121aed4e10d33e884076bb519b
Reviewed-on: https://chromium-review.googlesource.com/571345
Commit-Queue: Jinho Bang <jinho.bang@samsung.com>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487463}