Auto merge of #13795 - shinglyu:stylo-filter, r=Manishearth

Implement CSS filter for Stylo

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This patch is part of https://bugzilla.mozilla.org/show_bug.cgi?id=1310117

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components/style/gecko_bindings/structs_debug.rs

@@ -11203,7 +11203,7 @@ fn bindgen_test_layout_nsStyleSVG() {
 #[repr(C)]
 #[derive(Debug)]
 pub struct nsStyleFilter {
-    pub mType: i32,
+    pub mType: u32,
     pub mFilterParameter: nsStyleCoord,
     pub __bindgen_anon_1: nsStyleFilter__bindgen_ty_bindgen_id_236550,
 }