2 files changed, 47 insertions, 0 deletions
diff --git a/components/script/task_source/mod.rs b/components/script/task_source/mod.rs
index f716473f88a..d315b34fcae 100644
--- a/components/script/task_source/mod.rs
+++ b/components/script/task_source/mod.rs
@@ -8,6 +8,7 @@ pub mod history_traversal;
 pub mod media_element;
 pub mod networking;
 pub mod performance_timeline;
+pub mod port_message;
 pub mod remote_event;
 pub mod user_interaction;
 pub mod websocket;
@@ -28,6 +29,7 @@ pub enum TaskSourceName {
     HistoryTraversal,
     Networking,
     PerformanceTimeline,
+    PortMessage,
     UserInteraction,
     RemoteEvent,
     MediaElement,
diff --git a/components/script/task_source/port_message.rs b/components/script/task_source/port_message.rs
new file mode 100644
index 00000000000..8541f89bc64
--- /dev/null
+++ b/components/script/task_source/port_message.rs
@@ -0,0 +1,45 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use crate::script_runtime::{CommonScriptMsg, ScriptChan, ScriptThreadEventCategory};
+use crate::task::{TaskCanceller, TaskOnce};
+use crate::task_source::{TaskSource, TaskSourceName};
+use msg::constellation_msg::PipelineId;
+use std::fmt;
+
+#[derive(JSTraceable)]
+pub struct PortMessageQueue(pub Box<ScriptChan + Send + 'static>, pub PipelineId);
+
+impl Clone for PortMessageQueue {
+    fn clone(&self) -> PortMessageQueue {
+        PortMessageQueue(self.0.clone(), self.1.clone())
+    }
+}
+
+impl fmt::Debug for PortMessageQueue {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "PortMessageQueue(...)")
+    }
+}
+
+impl TaskSource for PortMessageQueue {
+    const NAME: TaskSourceName = TaskSourceName::PortMessage;
+
+    fn queue_with_canceller<T>(
+        &self,
+        task: T,
+        canceller: &TaskCanceller,
+    ) -> Result<(), ()>
+    where
+        T: TaskOnce + 'static,
+    {
+        let msg = CommonScriptMsg::Task(
+            ScriptThreadEventCategory::PortMessage,
+            Box::new(canceller.wrap_task(task)),
+            Some(self.1),
+            Self::NAME,
+        );
+        self.0.send(msg).map_err(|_| ())
+    }
+}