Bug 1681342 [wpt PR 26802] - Add WPT test about sandbox_flags and window reuse.,...

Bug 1681342 [wpt PR 26802] - Add WPT test about sandbox_flags and window reuse., a=testonly

Automatic update from web-platform-tests
Add WPT test about sandbox_flags and window reuse.

I found something interesting. The initial empty document's javascript
windows is reused for same-origin new document. We apply the sandbox
flags to the window, instead of documents, which is very weird. My
hypothesis: we are enforcing sandbox_flags twice into the same window.
The bug might be caused by the remanence of the initial sandbox flags?
This turned out to be the case. \o/

This patch adds a WPT test. It triggers a DCHECK in the browser process.

Bug: 1041376
Change-Id: Ic7543148b0c2571e95c0c4dfe6df50563254981b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2578957
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Ian Clelland <iclelland@chromium.org>
Reviewed-by: Łukasz Anforowicz <lukasza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834826}

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wpt-commits: 02df604cbf7d272dfa2e75533f345ba8ae74bac7
wpt-pr: 26802