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Because the original CL for this got reverted multiple times due to issues with working
with the build bots, the original CL has combined with a second CL (both described
below) such that the second CL moves the accessibility tests to a separate component.

From first CL:
- Adds html and js files for testing accessibility in Payment Request
- CL link: https://chromium-review.googlesource.com/c/578135
- Author: rayraymond

From second CL:
- Creates a new target, ios_chrome_payments_egtests, for Payment Request
  EG tests, in expectation of a dozen coming tests.
- Makes the target depend on the Payment Request test data in
  components/test/data/payments
- CL link: https://chromium-review.googlesource.com/c/575206
- Author: mahmadi

TBR=eugenebut@,lpromero@,michaeldo@,sdefresne@,eisinger@

Bug: 734571
Change-Id: I2a1213018dca57e14301b7188ac092ab9ff2ae56
Reviewed-on: https://chromium-review.googlesource.com/579647
Commit-Queue: Randall Raymond <rayraymond@google.com>
Reviewed-by: mahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488313}