Bug 1592868 [wpt PR 20012] - [SyntheticModules] Implements CSS Module…

…s, a=testonly

Automatic update from web-platform-tests
[SyntheticModules] Implements CSS Modules

This is the final change required for CSS Modules to be utilized by developers.
Following the acceptance of this change, if you run chromium with the CSSModules runtime flag, the following is now valid syntax:

<script type="module">
    import sheet from "./example.css";
</script>

CSS Modules Explainer:
https://github.com/w3c/webcomponents/blob/gh-pages/proposals/css-modules-v1-explainer.md

CSS Modules Spec PR:
whatwg/html#4898

Bug: 967018
Change-Id: Ifdee5b92259fb7e4e9c8f9aa88e69a98eb55c551
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1799923
Commit-Queue: Sam Sebree <sasebreemicrosoft.com>
Reviewed-by: Hiroshige Hayashizaki <hiroshigechromium.org>
Reviewed-by: Kouhei Ueno <kouheichromium.org>
Reviewed-by: Hiroki Nakagawa <nhirokichromium.org>
Reviewed-by: Yuki Shiino <yukishiinochromium.org>
Cr-Commit-Position: refs/heads/master{#724896}

--

wpt-commits: 6fbd872e9ac5fe60e32946bc9b318be6eeada123
wpt-pr: 20012

UltraBlame original commit: 8c5b203f0fad559c872cc96687daa54cda3803bb

testing/web-platform/tests/html/semantics/scripting-1/the-script-element/css-module/css-module-worker-test.html

@@ -0,0 +1,287 @@
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