Support default toJSON in WebIDL
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Ported related lines from gecko.
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Upgrade WebRender
This is against an old Servo because I can't build current Servo due to compile errors in RNG crates. I verified that it starts up.
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Fix DOMMatrix rotate test failure
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Rotation functions have been working backward because of https://github.com/servo/euclid/issues/354, so this temporarily fixes it.
cc @Manishearth
PS: How can I run bors-servo myself?
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- [x] These changes fix#23688
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