Use generics for the border-image-width property

components/style/values/computed/border.rs

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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//! Computed types for CSS values related to borders.
+
+use values::computed::Number;
+use values::computed::length::LengthOrPercentage;
+use values::generics::border::BorderImageWidthSide as GenericBorderImageWidthSide;
+use values::generics::rect::Rect;
+
+/// A computed value for the `border-image-width` property.
+pub type BorderImageWidth = Rect<BorderImageWidthSide>;
+
+/// A computed value for a single side of a `border-image-width` property.
+pub type BorderImageWidthSide = GenericBorderImageWidthSide<LengthOrPercentage, Number>;
+
+impl BorderImageWidthSide {
+    /// Returns `1`.
+    #[inline]
+    pub fn one() -> Self {
+        GenericBorderImageWidthSide::Number(1.)
+    }
+}