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Help determine causes of flakiness for Hyperlink issues, as well
as flaky tests for aria-hidden iframes.

Use @WAIT-FOR done with 50ms timeout in order to give iframe
sub documents a chance to load. The timeout is not ideal, but
there currently is no better way unless the iframe has some
actual contents to wait for.

Bug: 1158699,1157731
Change-Id: If6526616f6f9ceeac59a80c8ee8c2cb6b4d6e83a
Cq-Do-Not-Cancel-Tryjobs: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2611284
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841307}