CSP: A new set of test with form resubmission.
The goal of this set of test is to document the current interactions
between the "form-action" directive and form **re**submissions. It shows that
the CSP that applies are the one of frame/window that is reloading the
document, not the one that has initiated the reload.
BUG=
685074
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation;master.tryserver.chromium.linux:linux_site_isolation,linux_chromium_browser_side_navigation_rel
Review-Url:
https://codereview.chromium.org/2737343004
Cr-Commit-Position: refs/heads/master@{#458038}
Committed:
https://chromium.googlesource.com/chromium/src/+/01b5c7b1560e884426a2ef014c61acc74cd17a80