1 files changed, 51 insertions, 0 deletions
diff --git a/components/script/task_source/media_element.rs b/components/script/task_source/media_element.rs
new file mode 100644
index 00000000000..c0a902b373b
--- /dev/null
+++ b/components/script/task_source/media_element.rs
@@ -0,0 +1,51 @@
+/* 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 https://mozilla.org/MPL/2.0/. */
+
+use crate::dom::bindings::inheritance::Castable;
+use crate::dom::bindings::refcounted::Trusted;
+use crate::dom::event::SimpleEventTask;
+use crate::dom::eventtarget::EventTarget;
+use crate::dom::window::Window;
+use crate::script_runtime::{CommonScriptMsg, ScriptThreadEventCategory};
+use crate::script_thread::MainThreadScriptMsg;
+use crate::task::{TaskCanceller, TaskOnce};
+use crate::task_source::{TaskSource, TaskSourceName};
+use crossbeam_channel::Sender;
+use msg::constellation_msg::PipelineId;
+use servo_atoms::Atom;
+use std::fmt;
+use std::result::Result;
+
+#[derive(Clone, JSTraceable)]
+pub struct MediaElementTaskSource(pub Sender<MainThreadScriptMsg>, pub PipelineId);
+
+impl fmt::Debug for MediaElementTaskSource {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "MediaElementTaskSource(...)")
+    }
+}
+
+impl TaskSource for MediaElementTaskSource {
+    const NAME: TaskSourceName = TaskSourceName::MediaElement;
+
+    fn queue_with_canceller<T>(&self, task: T, canceller: &TaskCanceller) -> Result<(), ()>
+    where
+        T: TaskOnce + 'static,
+    {
+        let msg = MainThreadScriptMsg::Common(CommonScriptMsg::Task(
+            ScriptThreadEventCategory::ScriptEvent,
+            Box::new(canceller.wrap_task(task)),
+            Some(self.1),
+            MediaElementTaskSource::NAME,
+        ));
+        self.0.send(msg).map_err(|_| ())
+    }
+}
+
+impl MediaElementTaskSource {
+    pub fn queue_simple_event(&self, target: &EventTarget, name: Atom, window: &Window) {
+        let target = Trusted::new(target);
+        let _ = self.queue(SimpleEventTask { target, name }, window.upcast());
+    }
+}