[Payment Request] Mark some tests as flaky, and attempt fixes
Since crrev.com/2561373002 was submitted, cancelling out of the editor
will now go back to the "ready to pay" state with an item still
selected (given there was one selected prior to entering the editor).
This made a bunch of tests flaky, so this change
- marks known flaky tests as FlakyTest
- Attempts to fix some tests with mReadyToPay, although this is just
speculative at this point; a more comprehensive fix is in order.
BUG=
673371
TEST=PaymentRequest* (java)
Committed:
https://crrev.com/089ce14fd6cb33763968cb55adefdd3f6390c264
Cr-Commit-Position: refs/heads/master@{#438182}