Diff file for generic enum

generic-timing.diff

diff --git a/servo/components/style/cbindgen.toml b/servo/components/style/cbindgen.toml
index 8bcba69c0570..3bb5a75c2307 100644
--- a/servo/components/style/cbindgen.toml
+++ b/servo/components/style/cbindgen.toml
@@ -43,12 +43,13 @@ include = [
   "StyleComputedFontStyleDescriptor",
   "StyleComputedFontWeightRange",
   "StyleDisplay",
   "StyleDisplayMode",
   "StyleFillRule",
   "StyleFontDisplay",
   "StyleFontFaceSourceListComponent",
   "StyleFontLanguageOverride",
+  "StyleGenericTimingFunction",
   "StylePathCommand",
   "StyleUnicodeRange",
 ]
 item_types = ["enums", "structs", "typedefs"]
diff --git a/servo/components/style/values/generics/transform.rs b/servo/components/style/values/generics/transform.rs
index d398b40c3f10..0a69e589c34d 100644
--- a/servo/components/style/values/generics/transform.rs
+++ b/servo/components/style/values/generics/transform.rs
@@ -111,41 +111,68 @@ pub enum TimingFunction<Integer, Number> {
     #[css(comma, function)]
     #[value_info(other_values = "step-start,step-end")]
     Steps(Integer, #[css(skip_if = "is_end")] StepPosition),
     /// `frames(<integer>)`
     #[css(comma, function)]
     Frames(Integer),
 }
 
+/// A generic representation of above.
+#[derive(Clone, Copy, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToCss)]
+#[value_info(ty = "TIMING_FUNCTION")]
+#[repr(u8, C)]
+pub enum GenericTimingFunction<Integer, Number> {
+    /// `linear | ease | ease-in | ease-out | ease-in-out`
+    Keyword(TimingKeyword),
+    /// `cubic-bezier(<number>, <number>, <number>, <number>)`
+    #[allow(missing_docs)]
+    #[css(comma, function)]
+    CubicBezier {
+        x1: Number,
+        y1: Number,
+        x2: Number,
+        y2: Number,
+    },
+    /// `step-start | step-end | steps(<integer>, [ start | end ]?)`
+    #[css(comma, function)]
+    #[value_info(other_values = "step-start,step-end")]
+    Steps(Integer, #[css(skip_if = "is_end")] StepPosition),
+    /// `frames(<integer>)`
+    #[css(comma, function)]
+    Frames(Integer),
+}
+
 #[allow(missing_docs)]
 #[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
 #[derive(
     Clone,
     Copy,
     Debug,
     Eq,
     MallocSizeOf,
     Parse,
     PartialEq,
     SpecifiedValueInfo,
     ToComputedValue,
     ToCss,
 )]
+#[repr(u8)]
 pub enum TimingKeyword {
     Linear,
     Ease,
     EaseIn,
     EaseOut,
     EaseInOut,
 }
 
 #[allow(missing_docs)]
 #[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
 #[derive(Clone, Copy, Debug, Eq, MallocSizeOf, Parse, PartialEq, ToComputedValue, ToCss)]
+#[repr(u8)]
 pub enum StepPosition {
     Start,
     End,
 }
 
 #[inline]
 fn is_end(position: &StepPosition) -> bool {
     *position == StepPosition::End