script: Move WebRTC DOM interfaces to script/dom/webrtc/ (#39023)

Move interfaces defined by the WebRTC specification to the
`script/dom/webrtc/` module from `script/dom/`.

`script/dom/rtc*.rs -> script/dom/webrtc/`

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/webrtc/rtcrtpsender.rs

@@ -0,0 +1,59 @@
+/* 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 std::rc::Rc;
+
+use dom_struct::dom_struct;
+
+use crate::dom::bindings::codegen::Bindings::RTCRtpSenderBinding::{
+    RTCRtcpParameters, RTCRtpParameters, RTCRtpSendParameters, RTCRtpSenderMethods,
+};
+use crate::dom::bindings::reflector::{DomGlobal, Reflector, reflect_dom_object};
+use crate::dom::bindings::root::DomRoot;
+use crate::dom::bindings::str::DOMString;
+use crate::dom::globalscope::GlobalScope;
+use crate::dom::promise::Promise;
+use crate::script_runtime::CanGc;
+
+#[dom_struct]
+pub(crate) struct RTCRtpSender {
+    reflector_: Reflector,
+}
+
+impl RTCRtpSender {
+    fn new_inherited() -> Self {
+        Self {
+            reflector_: Reflector::new(),
+        }
+    }
+
+    pub(crate) fn new(global: &GlobalScope, can_gc: CanGc) -> DomRoot<Self> {
+        reflect_dom_object(Box::new(Self::new_inherited()), global, can_gc)
+    }
+}
+
+impl RTCRtpSenderMethods<crate::DomTypeHolder> for RTCRtpSender {
+    // https://w3c.github.io/webrtc-pc/#dom-rtcrtpsender-getparameters
+    fn GetParameters(&self) -> RTCRtpSendParameters {
+        RTCRtpSendParameters {
+            parent: RTCRtpParameters {
+                headerExtensions: vec![],
+                rtcp: RTCRtcpParameters {
+                    cname: None,
+                    reducedSize: None,
+                },
+                codecs: vec![],
+            },
+            transactionId: DOMString::new(),
+            encodings: vec![],
+        }
+    }
+
+    // https://w3c.github.io/webrtc-pc/#dom-rtcrtpsender-setparameters
+    fn SetParameters(&self, _parameters: &RTCRtpSendParameters, can_gc: CanGc) -> Rc<Promise> {
+        let promise = Promise::new(&self.global(), can_gc);
+        promise.resolve_native(&(), can_gc);
+        promise
+    }
+}