Enter realms more consistently during the script event loop.

components/script/dom/abstractworkerglobalscope.rs

@@ -9,6 +9,7 @@ use crate::dom::dedicatedworkerglobalscope::{AutoWorkerReset, DedicatedWorkerScr
 use crate::dom::globalscope::GlobalScope;
 use crate::dom::worker::TrustedWorkerAddress;
 use crate::dom::workerglobalscope::WorkerGlobalScope;
+use crate::realms::enter_realm;
 use crate::script_runtime::{CommonScriptMsg, ScriptChan, ScriptPort};
 use crate::task_queue::{QueuedTaskConversion, TaskQueue};
 use crossbeam_channel::{Receiver, Sender};
@@ -140,6 +141,7 @@ pub fn run_worker_event_loop<T, WorkerMsg, Event>(
     }
     // Step 3
     for event in sequential {
+        let _realm = enter_realm(&*worker_scope);
         if !worker_scope.handle_event(event) {
             // Shutdown
             return;

components/script/dom/htmlimageelement.rs

@@ -46,6 +46,7 @@ use crate::fetch::create_a_potential_cors_request;
 use crate::image_listener::{generate_cache_listener_for_element, ImageCacheListener};
 use crate::microtask::{Microtask, MicrotaskRunnable};
 use crate::network_listener::{self, NetworkListener, PreInvoke, ResourceTimingListener};
+use crate::realms::enter_realm;
 use crate::script_thread::ScriptThread;
 use crate::task_source::TaskSource;
 use app_units::{Au, AU_PER_PX};
@@ -56,6 +57,7 @@ use html5ever::{LocalName, Prefix, QualName};
 use ipc_channel::ipc;
 use ipc_channel::ipc::IpcSender;
 use ipc_channel::router::ROUTER;
+use js::jsapi::JSAutoRealm;
 use mime::{self, Mime};
 use msg::constellation_msg::PipelineId;
 use net_traits::image::base::{Image, ImageMetadata};
@@ -1353,6 +1355,13 @@ impl MicrotaskRunnable for ImageElementMicrotask {
             },
         }
     }
+
+    fn enter_realm(&self) -> JSAutoRealm {
+        match self {
+            &ImageElementMicrotask::StableStateUpdateImageDataTask { ref elem, .. } |
+            &ImageElementMicrotask::EnvironmentChangesTask { ref elem, .. } => enter_realm(&**elem),
+        }
+    }
 }
 
 pub trait LayoutHTMLImageElementHelpers {

components/script/dom/htmlmediaelement.rs

@@ -62,7 +62,7 @@ use crate::dom::virtualmethods::VirtualMethods;
 use crate::fetch::{create_a_potential_cors_request, FetchCanceller};
 use crate::microtask::{Microtask, MicrotaskRunnable};
 use crate::network_listener::{self, NetworkListener, PreInvoke, ResourceTimingListener};
-use crate::realms::InRealm;
+use crate::realms::{enter_realm, InRealm};
 use crate::script_thread::ScriptThread;
 use crate::task_source::TaskSource;
 use dom_struct::dom_struct;
@@ -74,6 +74,7 @@ use html5ever::{LocalName, Prefix};
 use http::header::{self, HeaderMap, HeaderValue};
 use ipc_channel::ipc;
 use ipc_channel::router::ROUTER;
+use js::jsapi::JSAutoRealm;
 use media::{glplayer_channel, GLPlayerMsg, GLPlayerMsgForward, WindowGLContext};
 use net_traits::image::base::Image;
 use net_traits::request::Destination;
@@ -2506,6 +2507,14 @@ impl MicrotaskRunnable for MediaElementMicrotask {
             },
         }
     }
+
+    fn enter_realm(&self) -> JSAutoRealm {
+        match self {
+            &MediaElementMicrotask::ResourceSelectionTask { ref elem, .. } |
+            &MediaElementMicrotask::PauseIfNotInDocumentTask { ref elem } |
+            &MediaElementMicrotask::SeekedTask { ref elem, .. } => enter_realm(&**elem),
+        }
+    }
 }
 
 enum Resource {

components/script/dom/servoparser/mod.rs

@@ -34,6 +34,7 @@ use crate::dom::processinginstruction::ProcessingInstruction;
 use crate::dom::text::Text;
 use crate::dom::virtualmethods::vtable_for;
 use crate::network_listener::PreInvoke;
+use crate::realms::enter_realm;
 use crate::script_thread::ScriptThread;
 use content_security_policy::{self as csp, CspList};
 use dom_struct::dom_struct;
@@ -828,6 +829,8 @@ impl FetchResponseListener for ParserContext {
             return;
         }
 
+        let _realm = enter_realm(&*parser.document);
+
         parser.document.set_csp_list(csp_list);
         self.parser = Some(Trusted::new(&*parser));
         self.submit_resource_timing();