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The intent is to measure the page loads that do a blocking (i.e.,
non-deferrable) subresource request with cookies to a third-party from
a first-party frame. This is meant in the context of prererendering:
deferrable means the request can be delayed until navigation, without
blocking progress by the prerendered page.

Currently this is only measuring synchronous classic (non-module)
<script> elements with cookies (not other credentials), but this may
expand later.

Bug: 1131317
Change-Id: I34eea95c67501406928875ce3fe3c3c14e6f372e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2423757
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Hiroshige Hayashizaki <hiroshige@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810192}