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script: Load and rasterize favicons before passing them to the embedder (#38949)

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Currently the embedding API only provides the embedder with the URL for
a favicon. This is not great, for multiple reasons:
* Loading the icon should happen according to the fetch spec which is
not easy for the embedder to recreate (consider CSP, timing information
etc)
* Rasterizing a svg favicon is not trivial

With this change, servo fetches and rasterizes the icon to a bitmap
which is then passed to the embedder.

Testing: I'm not sure how I can write tests for the embedding api. I've
tested the correctness manually using
https://github.com/servo/servo/pull/36680.
Prepares for https://github.com/servo/servo/pull/36680

---------

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>
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Simon Wülker 2025-08-27 16:28:42 +02:00 • committed by GitHub
parent a5d890c13a
commit dcd25072d3
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9 changed files with 373 additions and 159 deletions
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4
tests/wpt/meta/content-security-policy/img-src/icon-blocked.sub.html.ini vendored
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@ -1,4 +0,0 @@
[icon-blocked.sub.html]
expected: TIMEOUT
[Test that spv event is fired]
expected: NOTRUN