Allow border radii to be set via preshints

components/style/values/generics/mod.rs

@@ -26,6 +26,12 @@ impl<L> HasViewportPercentage for BorderRadiusSize<L> {
     fn has_viewport_percentage(&self) -> bool { false }
 }
 
+impl<L: Clone> From<L> for BorderRadiusSize<L> {
+    fn from(other: L) -> Self {
+        Self::new(other.clone(), other)
+    }
+}
+
 impl<L> BorderRadiusSize<L> {
     #[inline]
     /// Create a new `BorderRadiusSize` for an area of given width and height.

ports/geckolib/glue.rs

@@ -1570,7 +1570,7 @@ pub extern "C" fn Servo_DeclarationBlock_SetPixelValue(declarations:
     use style::properties::{PropertyDeclaration, LonghandId};
     use style::properties::longhands::border_spacing::SpecifiedValue as BorderSpacing;
     use style::values::specified::BorderWidth;
-    use style::values::specified::length::NoCalcLength;
+    use style::values::specified::length::{NoCalcLength, LengthOrPercentage};
 
     let long = get_longhand_from_id!(property);
     let nocalc = NoCalcLength::from_px(value);
@@ -1596,6 +1596,10 @@ pub extern "C" fn Servo_DeclarationBlock_SetPixelValue(declarations:
                 vertical: None,
             }
         ),
+        BorderTopLeftRadius => Box::new(LengthOrPercentage::from(nocalc).into()),
+        BorderTopRightRadius => Box::new(LengthOrPercentage::from(nocalc).into()),
+        BorderBottomLeftRadius => Box::new(LengthOrPercentage::from(nocalc).into()),
+        BorderBottomRightRadius => Box::new(LengthOrPercentage::from(nocalc).into()),
     };
     write_locked_arc(declarations, |decls: &mut PropertyDeclarationBlock| {
         decls.push(prop, Importance::Normal);