Store custom properties in keyframes into servo's PropertyDeclarationBlock

Cargo.lock

@@ -1068,6 +1068,7 @@ dependencies = [
  "parking_lot 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "selectors 0.19.0",
  "servo_arc 0.0.1",
+ "smallvec 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "style 0.0.1",
  "style_traits 0.0.1",
  "stylo_tests 0.0.1",
@@ -3235,6 +3236,7 @@ dependencies = [
  "regex 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "selectors 0.19.0",
  "size_of_test 0.0.1",
+ "smallvec 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "style 0.0.1",
  "style_traits 0.0.1",
 ]

components/style/properties/properties.mako.rs

@@ -1514,6 +1514,12 @@ impl PropertyDeclaration {
         }
     }
 
+    /// Returns true if this property is a custom property, false
+    /// otherwise.
+    pub fn is_custom(&self) -> bool {
+        matches!(*self, PropertyDeclaration::Custom(_, _))
+    }
+
     /// The `context` parameter controls this:
     ///
     /// https://drafts.csswg.org/css-animations/#keyframes

ports/geckolib/Cargo.toml

@@ -28,6 +28,7 @@ parking_lot = "0.4"
 # for the cargo problem behind this.
 selectors = {path = "../../components/selectors", features = ["gecko_like_types"]}
 servo_arc = {path = "../../components/servo_arc"}
+smallvec = "0.4"
 style = {path = "../../components/style", features = ["gecko"]}
 style_traits = {path = "../../components/style_traits"}
 

ports/geckolib/glue.rs

@@ -3552,6 +3552,8 @@ pub extern "C" fn Servo_StyleSet_GetKeyframesForName(raw_data: RawServoStyleSetB
                                                      name: *const nsACString,
                                                      inherited_timing_function: nsTimingFunctionBorrowed,
                                                      keyframes: RawGeckoKeyframeListBorrowedMut) -> bool {
+    use smallvec::SmallVec;
+
     debug_assert!(keyframes.len() == 0,
                   "keyframes should be initially empty");
 
@@ -3623,6 +3625,25 @@ pub extern "C" fn Servo_StyleSet_GetKeyframesForName(raw_data: RawServoStyleSetB
                     guard.normal_declaration_iter()
                          .filter(|declaration| declaration.is_animatable());
 
+                let custom_properties: SmallVec<[&PropertyDeclaration; 1]> =
+                    guard.normal_declaration_iter()
+                         .filter(|declaration| declaration.is_custom())
+                         .collect();
+
+                if custom_properties.len() > 0 {
+                    let mut pdb = PropertyDeclarationBlock::new();
+                    for custom in custom_properties.iter() {
+                        pdb.push((*custom).clone(), Importance::Normal);
+                    }
+                    unsafe {
+                        let pair =
+                            Gecko_AppendPropertyValuePair(&mut (*keyframe).mPropertyValues,
+                                                          nsCSSPropertyID::eCSSPropertyExtra_variable);
+                        (*pair).mServoDeclarationBlock.set_arc_leaky(
+                            Arc::new(global_style_data.shared_lock.wrap(pdb)));
+                    }
+                }
+
                 for declaration in animatable {
                     let property = AnimatableLonghand::from_declaration(declaration).unwrap();
                     // Skip the 'display' property because although it is animatable from SMIL,

ports/geckolib/lib.rs

@@ -11,6 +11,7 @@ extern crate libc;
 extern crate malloc_size_of;
 extern crate selectors;
 extern crate servo_arc;
+extern crate smallvec;
 #[macro_use] extern crate style;
 extern crate style_traits;
 

tests/unit/stylo/Cargo.toml

@@ -22,6 +22,7 @@ log = {version = "0.3.5", features = ["release_max_level_info"]}
 malloc_size_of = {path = "../../../components/malloc_size_of"}
 selectors = {path = "../../../components/selectors", features = ["gecko_like_types"]}
 size_of_test = {path = "../../../components/size_of_test"}
+smallvec = "0.4"
 style_traits = {path = "../../../components/style_traits"}
 style = {path = "../../../components/style", features = ["gecko"]}
 

tests/unit/stylo/lib.rs

@@ -9,6 +9,7 @@ extern crate geckoservo;
 #[macro_use] extern crate log;
 extern crate malloc_size_of;
 extern crate selectors;
+extern crate smallvec;
 #[macro_use] extern crate size_of_test;
 #[macro_use] extern crate style;
 extern crate style_traits;