Use webxr IPC to get a WebXR device registry to each script thread

components/constellation/Cargo.toml

@@ -50,6 +50,7 @@ servo_remutex = {path = "../remutex"}
 servo_url = {path = "../url"}
 webvr_traits = {path = "../webvr_traits"}
 webrender_api = {git = "https://github.com/servo/webrender", features = ["ipc"]}
+webxr-api = {git = "https://github.com/servo/webxr", features = ["ipc"]}
 
 [target.'cfg(all(not(target_os = "windows"), not(target_os = "ios"), not(target_os="android"), not(target_arch="arm"), not(target_arch="aarch64")))'.dependencies]
 gaol = {git = "https://github.com/servo/gaol"}

components/constellation/constellation.rs

@@ -390,6 +390,9 @@ pub struct Constellation<Message, LTF, STF> {
     /// A channel through which messages can be sent to the webvr thread.
     webvr_chan: Option<IpcSender<WebVRMsg>>,
 
+    /// The XR device registry
+    webxr_registry: webxr_api::Registry,
+
     /// A channel through which messages can be sent to the canvas paint thread.
     canvas_chan: IpcSender<CanvasMsg>,
 
@@ -455,6 +458,9 @@ pub struct InitialConstellationState {
 
     /// A channel to the webgl thread.
     pub webvr_chan: Option<IpcSender<WebVRMsg>>,
+
+    /// The XR device registry
+    pub webxr_registry: webxr_api::Registry,
 }
 
 /// Data needed for webdriver
@@ -751,6 +757,7 @@ where
                     }),
                     webgl_threads: state.webgl_threads,
                     webvr_chan: state.webvr_chan,
+                    webxr_registry: state.webxr_registry,
                     canvas_chan: CanvasPaintThread::start(),
                     pending_approval_navigations: HashMap::new(),
                     pressed_mouse_buttons: 0,
@@ -997,6 +1004,7 @@ where
                 .as_ref()
                 .map(|threads| threads.pipeline()),
             webvr_chan: self.webvr_chan.clone(),
+            webxr_registry: self.webxr_registry.clone(),
         });
 
         let pipeline = match result {

components/constellation/pipeline.rs

@@ -188,6 +188,9 @@ pub struct InitialPipelineState {
 
     /// A channel to the webvr thread.
     pub webvr_chan: Option<IpcSender<WebVRMsg>>,
+
+    /// The XR device registry
+    pub webxr_registry: webxr_api::Registry,
 }
 
 pub struct NewPipeline {
@@ -305,6 +308,7 @@ impl Pipeline {
                     webrender_document: state.webrender_document,
                     webgl_chan: state.webgl_chan,
                     webvr_chan: state.webvr_chan,
+                    webxr_registry: state.webxr_registry,
                 };
 
                 // Spawn the child process.
@@ -510,6 +514,7 @@ pub struct UnprivilegedPipelineContent {
     webrender_document: webrender_api::DocumentId,
     webgl_chan: Option<WebGLPipeline>,
     webvr_chan: Option<IpcSender<WebVRMsg>>,
+    webxr_registry: webxr_api::Registry,
 }
 
 impl UnprivilegedPipelineContent {
@@ -554,6 +559,7 @@ impl UnprivilegedPipelineContent {
                 content_process_shutdown_chan: self.script_content_process_shutdown_chan,
                 webgl_chan: self.webgl_chan,
                 webvr_chan: self.webvr_chan,
+                webxr_registry: self.webxr_registry,
                 webrender_document: self.webrender_document,
                 webrender_api_sender: self.webrender_api_sender.clone(),
                 layout_is_busy: layout_thread_busy_flag.clone(),