Auto merge of #25468 - gterzian:add_generic_to_frozen_array, r=Manishearth

Add generic to frozen array

<!-- Please describe your changes on the following line: -->

https://github.com/servo/servo/pull/25467#discussion_r364575071

Depends on https://github.com/servo/servo/pull/25467

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: -->
- [ ] `./mach build -d` does not report any errors
- [ ] `./mach test-tidy` does not report any errors
- [ ] These changes fix #___ (GitHub issue number if applicable)

<!-- Either: -->
- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because ___

<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

components/script/dom/bindings/utils.rs

@@ -10,10 +10,8 @@ use crate::dom::bindings::codegen::PrototypeList::{MAX_PROTO_CHAIN_LENGTH, PROTO
 use crate::dom::bindings::conversions::{jsstring_to_str, private_from_proto_check};
 use crate::dom::bindings::error::throw_invalid_this;
 use crate::dom::bindings::inheritance::TopTypeId;
-use crate::dom::bindings::root::DomRoot;
 use crate::dom::bindings::str::DOMString;
 use crate::dom::bindings::trace::trace_object;
-use crate::dom::messageport::MessagePort;
 use crate::dom::windowproxy;
 use crate::script_runtime::JSContext as SafeJSContext;
 use js::conversions::{jsstr_to_string, ToJSValConvertible};
@@ -126,12 +124,9 @@ impl Clone for DOMJSClass {
 unsafe impl Sync for DOMJSClass {}
 
 /// Returns a JSVal representing a frozen array of ports
-pub fn message_ports_to_frozen_array(
-    message_ports: &[DomRoot<MessagePort>],
-    cx: SafeJSContext,
-) -> JSVal {
+pub fn to_frozen_array<T: ToJSValConvertible>(convertibles: &[T], cx: SafeJSContext) -> JSVal {
     rooted!(in(*cx) let mut ports = UndefinedValue());
-    unsafe { message_ports.to_jsval(*cx, ports.handle_mut()) };
+    unsafe { convertibles.to_jsval(*cx, ports.handle_mut()) };
 
     rooted!(in(*cx) let obj = ports.to_object());
     unsafe { JS_FreezeObject(*cx, RawHandleObject::from(obj.handle())) };