script: Move WebGL DOM interfaces to script/dom/webgl/ (#38995)

Move interfaces defined by the WebGL spec to the `script/dom/webgl/
`module from `script/dom/`.

`script/dom/webgl*.rs` -> `script/dom/webgl/`
`script/dom/webgl_extensions` -> `script/dom/webgl/extensions`
`script/dom/webgl_validations` -> `script/dom/webgl/validations`

Testing: No changes, just a refactoring

Fixes (partially): #38901

Signed-off-by: Andrei Volykhin <volykhin.andrei@huawei.com>
Co-authored-by: Andrei Volykhin <volykhin.andrei@huawei.com>

components/script/dom/webgl/webglcontextevent.rs

@@ -0,0 +1,118 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+use dom_struct::dom_struct;
+use js::rust::HandleObject;
+use stylo_atoms::Atom;
+
+use crate::dom::bindings::codegen::Bindings::EventBinding::EventMethods;
+use crate::dom::bindings::codegen::Bindings::WebGLContextEventBinding::{
+    WebGLContextEventInit, WebGLContextEventMethods,
+};
+use crate::dom::bindings::error::Fallible;
+use crate::dom::bindings::inheritance::Castable;
+use crate::dom::bindings::reflector::reflect_dom_object_with_proto;
+use crate::dom::bindings::root::DomRoot;
+use crate::dom::bindings::str::DOMString;
+use crate::dom::event::{Event, EventBubbles, EventCancelable};
+use crate::dom::window::Window;
+use crate::script_runtime::CanGc;
+
+#[dom_struct]
+pub(crate) struct WebGLContextEvent {
+    event: Event,
+    status_message: DOMString,
+}
+
+impl WebGLContextEventMethods<crate::DomTypeHolder> for WebGLContextEvent {
+    // https://registry.khronos.org/webgl/specs/latest/1.0/#5.15
+    fn Constructor(
+        window: &Window,
+        proto: Option<HandleObject>,
+        can_gc: CanGc,
+        type_: DOMString,
+        init: &WebGLContextEventInit,
+    ) -> Fallible<DomRoot<WebGLContextEvent>> {
+        let status_message = match init.statusMessage.as_ref() {
+            Some(message) => message.clone(),
+            None => DOMString::new(),
+        };
+
+        let bubbles = EventBubbles::from(init.parent.bubbles);
+
+        let cancelable = EventCancelable::from(init.parent.cancelable);
+
+        Ok(WebGLContextEvent::new_with_proto(
+            window,
+            proto,
+            Atom::from(type_),
+            bubbles,
+            cancelable,
+            status_message,
+            can_gc,
+        ))
+    }
+
+    // https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.15
+    fn StatusMessage(&self) -> DOMString {
+        self.status_message.clone()
+    }
+
+    // https://dom.spec.whatwg.org/#dom-event-istrusted
+    fn IsTrusted(&self) -> bool {
+        self.event.IsTrusted()
+    }
+}
+
+impl WebGLContextEvent {
+    fn new_inherited(status_message: DOMString) -> WebGLContextEvent {
+        WebGLContextEvent {
+            event: Event::new_inherited(),
+            status_message,
+        }
+    }
+
+    pub(crate) fn new(
+        window: &Window,
+        type_: Atom,
+        bubbles: EventBubbles,
+        cancelable: EventCancelable,
+        status_message: DOMString,
+        can_gc: CanGc,
+    ) -> DomRoot<WebGLContextEvent> {
+        Self::new_with_proto(
+            window,
+            None,
+            type_,
+            bubbles,
+            cancelable,
+            status_message,
+            can_gc,
+        )
+    }
+
+    fn new_with_proto(
+        window: &Window,
+        proto: Option<HandleObject>,
+        type_: Atom,
+        bubbles: EventBubbles,
+        cancelable: EventCancelable,
+        status_message: DOMString,
+        can_gc: CanGc,
+    ) -> DomRoot<WebGLContextEvent> {
+        let event = reflect_dom_object_with_proto(
+            Box::new(WebGLContextEvent::new_inherited(status_message)),
+            window,
+            proto,
+            can_gc,
+        );
+
+        {
+            let parent = event.upcast::<Event>();
+            parent.init_event(type_, bool::from(bubbles), bool::from(cancelable));
+        }
+
+        event
+    }
+}