Auto merge of #24499 - ferjm:media.session.api, r=Manishearth

Media Session API

- [X] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #24172
- [x] There are tests for these changes

This PR introduces all the pieces required to prove an end to end media session flow with Android as a test platform.

1 files changed, 14 insertions, 1 deletions

diff --git a/components/script/script_thread.rs b/components/script/script_thread.rs
index dbc4f0fb444..c0155ea63a5 100644
--- a/components/script/script_thread.rs
+++ b/components/script/script_thread.rs
@@ -138,7 +138,7 @@ use script_traits::{
     DiscardBrowsingContext, DocumentActivity, EventResult, HistoryEntryReplacement,
 };
 use script_traits::{InitialScriptState, JsEvalResult, LayoutMsg, LoadData, LoadOrigin};
-use script_traits::{MouseButton, MouseEventType, NewLayoutInfo};
+use script_traits::{MediaSessionActionType, MouseButton, MouseEventType, NewLayoutInfo};
 use script_traits::{Painter, ProgressiveWebMetricType, ScriptMsg, ScriptThreadFactory};
 use script_traits::{ScriptToConstellationChan, TimerEvent, TimerSchedulerMsg};
 use script_traits::{TimerSource, TouchEventType, TouchId, UntrustedNodeAddress, WheelDelta};
@@ -1713,6 +1713,7 @@ impl ScriptThread {
                     WebVREvents(id, ..) => Some(id),
                     PaintMetric(..) => None,
                     ExitFullScreen(id, ..) => Some(id),
+                    MediaSessionAction(..) => None,
                 }
             },
             MixedMessage::FromDevtools(_) => None,
@@ -1942,6 +1943,9 @@ impl ScriptThread {
             ConstellationControlMsg::PaintMetric(pipeline_id, metric_type, metric_value) => {
                 self.handle_paint_metric(pipeline_id, metric_type, metric_value)
             },
+            ConstellationControlMsg::MediaSessionAction(pipeline_id, action) => {
+                self.handle_media_session_action(pipeline_id, action)
+            },
             msg @ ConstellationControlMsg::AttachLayout(..) |
             msg @ ConstellationControlMsg::Viewport(..) |
             msg @ ConstellationControlMsg::SetScrollState(..) |
@@ -3925,6 +3929,15 @@ impl ScriptThread {
         }
     }
 
+    fn handle_media_session_action(&self, pipeline_id: PipelineId, action: MediaSessionActionType) {
+        if let Some(window) = self.documents.borrow().find_window(pipeline_id) {
+            let media_session = window.Navigator().MediaSession();
+            media_session.handle_action(action);
+        } else {
+            warn!("No MediaSession for this pipeline ID");
+        };
+    }
+
     pub fn enqueue_microtask(job: Microtask) {
         SCRIPT_THREAD_ROOT.with(|root| {
             let script_thread = unsafe { &*root.get().unwrap() };