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This patch adds a test for JSON serialization of a very long string
being passed into PaymentRequest API.

Bug: 1110324, 1115091
Change-Id: Ia6690b2f41ff99190afed4431854515b167056b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2348411
Commit-Queue: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Nick Burris <nburris@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#797165}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2359155
Cr-Commit-Position: refs/heads/master@{#803617}