Auto merge of #28546 - yvt:feat-cow-infra, r=jdm

Implement `Location`'s custom internal methods

This PR partly resurrects #16501 and introduces the use of principals object to associate objects and Realms with origins. Using this infrastructure, this PR implements [the custom internal methods][1] of the `Location` interface, which is "maybe-cross-origin".

Unimplemented/incomplete things:

 - Other maybe-cross-origin interfaces, namely `WindowProxy` and `DissimilarWindowLocation`, aren't implemented correctly yet (causing most test cases of `tests/wpt/web-platform-tests/html/browsers/origin/cross-origin-objects/cross-origin-objects.html` to fail).
     - `WindowProxy`: #28556
 - [The "perform a security check" operation][2] and `Location`'s non-cross-origin properties' relevant `Document` origin checks aren't implemented either (not sure if they are covered by the existing tests).
 - There are a slight deviation from the standard and inefficiency in `CrossOriginGetOwnPropertyHelper`'s current implementation.
     - #28557

[1]: https://html.spec.whatwg.org/multipage/#the-location-interface
[2]: https://html.spec.whatwg.org/multipage/browsers.html#integration-with-idl

---
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #16243 and make some progress in #2382

---
- [x] There are tests for these changes OR
- [ ] These changes do not require tests because ___

1 files changed, 6 insertions, 1 deletions

diff --git a/components/script/dom/bindings/interface.rs b/components/script/dom/bindings/interface.rs
index 82303f800ba..f73152c9df7 100644
--- a/components/script/dom/bindings/interface.rs
+++ b/components/script/dom/bindings/interface.rs
@@ -9,6 +9,7 @@ use crate::dom::bindings::codegen::PrototypeList;
 use crate::dom::bindings::constant::{define_constants, ConstantSpec};
 use crate::dom::bindings::conversions::{get_dom_class, DOM_OBJECT_SLOT};
 use crate::dom::bindings::guard::Guard;
+use crate::dom::bindings::principals::ServoJSPrincipals;
 use crate::dom::bindings::utils::{ProtoOrIfaceArray, DOM_PROTOTYPE_SLOT};
 use crate::script_runtime::JSContext as SafeJSContext;
 use js::error::throw_type_error;
@@ -36,6 +37,7 @@ use js::rust::wrappers::{JS_DefineProperty3, JS_DefineProperty4, JS_DefineProper
 use js::rust::wrappers::{JS_LinkConstructorAndPrototype, JS_NewObjectWithGivenProto};
 use js::rust::{define_methods, define_properties, get_object_class};
 use js::rust::{HandleObject, HandleValue, MutableHandleObject, RealmOptions};
+use servo_url::MutableOrigin;
 use std::convert::TryFrom;
 use std::ptr;
 
@@ -136,6 +138,7 @@ pub unsafe fn create_global_object(
     private: *const libc::c_void,
     trace: TraceHook,
     mut rval: MutableHandleObject,
+    origin: &MutableOrigin,
 ) {
     assert!(rval.is_null());
 
@@ -145,10 +148,12 @@ pub unsafe fn create_global_object(
     options.creationOptions_.streams_ = true;
     select_compartment(cx, &mut options);
 
+    let principal = ServoJSPrincipals::new(origin);
+
     rval.set(JS_NewGlobalObject(
         *cx,
         class,
-        ptr::null_mut(),
+        principal.as_raw(),
         OnNewGlobalHookOption::DontFireOnNewGlobalHook,
         &*options,
     ));