Auto merge of #22495 - maharsh312:master, r=jdm

OffscreenCanvas API

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Initial Steps for OffscreenCanvas API are done in this commit.

r? @jdm
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- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #14627 (GitHub issue number if applicable)

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- [X] There are tests for these changes OR
- [ ] These changes do not require tests because ___

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tests/wpt/metadata/html/semantics/embedded-content/the-img-element/environment-changes/viewport-change.html.ini

@@ -4,7 +4,7 @@
     expected: FAIL
 
   [picture: source (max-width:500px) valid image, img valid image, resize to wide]
-    expected: FAIL
+    expected: TIMEOUT
 
   [picture: source (max-width:500px) valid image, img broken image, resize to narrow]
     expected: FAIL