compositing: Make the constellation messages serializable.

components/style/Cargo.toml

@@ -25,7 +25,7 @@ encoding = "0.2"
 fnv = "1.0"
 rustc-serialize = "0.3"
 matches = "0.1"
-url = "0.2.35"
+url = "0.2.36"
 bitflags = "*"
 cssparser = "0.3.2"
 num = "0.1.24"

components/style/lib.rs

@@ -11,6 +11,7 @@
 #![feature(plugin)]
 #![feature(vec_push_all)]
 
+#![plugin(serde_macros)]
 #![plugin(string_cache_plugin)]
 #![plugin(serde_macros)]
 #![plugin(plugins)]

components/style/viewport.rs

@@ -305,7 +305,7 @@ impl<'a, I> ViewportDescriptorDeclarationCascade for I
     }
 }
 
-#[derive(Debug, PartialEq)]
+#[derive(Debug, PartialEq, Deserialize, Serialize)]
 pub struct ViewportConstraints {
     pub size: TypedSize2D<ViewportPx, f32>,