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Before this patch, all TWA payment apps on Chrome OS were available for
payment, even if they implemented an IS_READY_TO_PAY service that
replied "false" to the query (when
chrome://flags/#enable-web-payments-experimental-features flag was
enabled).

This patch queries the IS_READY_TO_PAY service of the TWA payment app on
Chrome OS and enables payments only if the service is absent or returns
"true".

After this patch, the TWA payment app can control at runtime whether
it's able to handle payments.

Bug: 1061503
Change-Id: Idb267c0bbe2d8bb9173bcfde1b9a25e47a7fc505
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2269744
Commit-Queue: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Danyao Wang <danyao@chromium.org>
Reviewed-by: Liquan (Max) Gu <maxlg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798600}