GitLab

Change:
* Add an ability for Android browser test to click the close button
on the opened payment handler UI.
* Test launching payment handler twice to prevent crbug.com/1131874 from
happening again.

Bug: 1131874

Change-Id: Id43def5f2d2be4a40e34eda1219942dabd70485e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2434769
Commit-Queue: Liquan (Max) Gu <maxlg@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811847}