Stub out Trusted Types interfaces (#36355)

Some methods are implemented fully, while others are implemented
partly. With these implementations, there are no observed crashes
when running the trusted-types web-platform-tests.

Most notably, the tests/wpt/tests/trusted-types/idlharness.window.js
is now fully passing.

Part of #36258

Signed-off-by: Tim van der Lippe <tvanderlippe@gmail.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/components/script/dom/workerglobalscope.rs b/components/script/dom/workerglobalscope.rs
index 3937f8fbedb..7009f51e29a 100644
--- a/components/script/dom/workerglobalscope.rs
+++ b/components/script/dom/workerglobalscope.rs
@@ -52,6 +52,7 @@ use crate::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope;
 use crate::dom::globalscope::GlobalScope;
 use crate::dom::performance::Performance;
 use crate::dom::promise::Promise;
+use crate::dom::trustedtypepolicyfactory::TrustedTypePolicyFactory;
 #[cfg(feature = "webgpu")]
 use crate::dom::webgpu::identityhub::IdentityHub;
 use crate::dom::window::{base64_atob, base64_btoa};
@@ -122,6 +123,7 @@ pub(crate) struct WorkerGlobalScope {
     #[no_trace]
     navigation_start: CrossProcessInstant,
     performance: MutNullableDom<Performance>,
+    trusted_types: MutNullableDom<TrustedTypePolicyFactory>,
 
     /// A [`TimerScheduler`] used to schedule timers for this [`WorkerGlobalScope`].
     /// Timers are handled in the service worker event loop.
@@ -184,6 +186,7 @@ impl WorkerGlobalScope {
             performance: Default::default(),
             timer_scheduler: RefCell::default(),
             insecure_requests_policy,
+            trusted_types: Default::default(),
         }
     }
 
@@ -477,6 +480,14 @@ impl WorkerGlobalScopeMethods<crate::DomTypeHolder> for WorkerGlobalScope {
         self.upcast::<GlobalScope>()
             .structured_clone(cx, value, options, retval)
     }
+
+    /// <https://www.w3.org/TR/trusted-types/#dom-windoworworkerglobalscope-trustedtypes>
+    fn TrustedTypes(&self, can_gc: CanGc) -> DomRoot<TrustedTypePolicyFactory> {
+        self.trusted_types.or_init(|| {
+            let global_scope = self.upcast::<GlobalScope>();
+            TrustedTypePolicyFactory::new(global_scope, can_gc)
+        })
+    }
 }
 
 impl WorkerGlobalScope {