Make use of Servo's border-spacing in Stylo

components/style/properties/gecko.mako.rs

@@ -1443,6 +1443,22 @@ fn static_assert() {
 </%self:impl_trait>
 
 
+<%self:impl_trait style_struct_name="InheritedTable"
+                  skip_longhands="border-spacing">
+
+    pub fn set_border_spacing(&mut self, v: longhands::border_spacing::computed_value::T) {
+        self.gecko.mBorderSpacingCol = v.horizontal.0;
+        self.gecko.mBorderSpacingRow = v.vertical.0;
+    }
+
+    pub fn copy_border_spacing_from(&mut self, other: &Self) {
+        self.gecko.mBorderSpacingCol = other.gecko.mBorderSpacingCol;
+        self.gecko.mBorderSpacingRow = other.gecko.mBorderSpacingRow;
+    }
+
+</%self:impl_trait>
+
+
 <%self:impl_trait style_struct_name="InheritedText"
                   skip_longhands="text-align text-shadow line-height word-spacing">
 

components/style/properties/longhand/inherited_table.mako.rs

@@ -16,7 +16,7 @@ ${helpers.single_keyword("caption-side", "top bottom",
                          extra_gecko_values="right left top-outside bottom-outside",
                          animatable=False)}
 
-<%helpers:longhand name="border-spacing" products="servo" animatable="False">
+<%helpers:longhand name="border-spacing" animatable="False">
     use app_units::Au;
     use values::LocalToCss;
     use values::HasViewportPercentage;