Add a test for the TrustedDOMTypes origin trial integration

Change-Id: I2bfe4f20b0980dfa920586becfe9f2b9f9a97d87
Bug: 970240,934451
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1669231
Reviewed-by: Ian Clelland <iclelland@chromium.org>
Commit-Queue: Ian Clelland <iclelland@chromium.org>
Auto-Submit: Allen Robinson <arobins@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672126}
1 file changed