Auto merge of #29686 - Loirooriol:normalize-border-radius, r=mrobinson

Normalize corner radii that add up to > 100%

WebRender already seems to be doing this normalization, but this is needed by inner_radii in order to properly compute the reduced radii when background-clip is content-box or padding-box.

This will also be needed for expanding the radii for box-shadow or outline.

Test: css/css-backgrounds/background-rounded-image-clip-002.html

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