Bug 1473361 [wpt PR 11777] - Make preload play nice with CSP strict-dynamic, a=testonly

Bug 1473361 [wpt PR 11777] - Make preload play nice with CSP strict-dynamic, a=testonly

Automatic update from web-platform-testsMake preload play nice with CSP strict-dynamic

Dynamically loaded preloaded scripts were not loaded when a strict-dynamic
CSP directive was used. This was because the state regarding whether the
element was parser created or not was not properly propoagated to the CSP
checks. This CL fixes that and adds tests that make sure that such scripts
can be preloaded (and that markup based preloaded scripts with no nonce cannot).

Bug: 752922
Change-Id: Ib4f3bce8583ccc9770c261d76167243033e5a112
Reviewed-on: https://chromium-review.googlesource.com/1125064
Reviewed-by: Andy Paicu <andypaicu@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Commit-Queue: Yoav Weiss <yoav@yoav.ws>
Cr-Commit-Position: refs/heads/master@{#572908}

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wpt-commits: e6ac489577c1ac1e0dadd9bef80e63af2a2eb42a
wpt-pr: 11777