Final steps

components/devtools_traits/lib.rs

@@ -36,6 +36,7 @@ use std::net::TcpStream;
 use time::Duration;
 use time::Tm;
 use url::Url;
+use util::mem::HeapSizeOf;
 
 // Information would be attached to NewGlobal to be received and show in devtools.
 // Extend these fields if we need more information.
@@ -45,6 +46,14 @@ pub struct DevtoolsPageInfo {
     pub url: Url
 }
 
+#[derive(Deserialize, HeapSizeOf, Serialize, Clone)]
+pub struct CSSError {
+    pub filename: String,
+    pub line: u32,
+    pub column: u32,
+    pub msg: String
+}
+
 /// Messages to instruct the devtools server to update its known actors/state
 /// according to changes in the browser.
 pub enum DevtoolsControlMsg {
@@ -78,6 +87,9 @@ pub enum ScriptToDevtoolsControlMsg {
     /// An animation frame with the given timestamp was processed in a script thread.
     /// The actor with the provided name should be notified.
     FramerateTick(String, f64),
+
+    /// Report a CSS parse error for the given pipeline
+    ReportCSSError(PipelineId, CSSError),
 }
 
 /// Serialized JS return values