feat(webidl): expose arraybuffer overload in body idl

components/script/body.rs

@@ -27,7 +27,8 @@ pub enum BodyType {
     Blob,
     FormData,
     Json,
-    Text
+    Text,
+    ArrayBuffer
 }
 
 pub enum FetchedData {

components/script/dom/request.rs

@@ -611,6 +611,12 @@ impl RequestMethods for Request {
     fn Json(&self) -> Rc<Promise> {
         consume_body(self, BodyType::Json)
     }
+
+    #[allow(unrooted_must_root)]
+    // https://fetch.spec.whatwg.org/#dom-body-arraybuffer
+    fn ArrayBuffer(&self) -> Rc<Promise> {
+        consume_body(self, BodyType::ArrayBuffer)
+    }
 }
 
 impl BodyOperations for Request {

components/script/dom/response.rs

@@ -354,6 +354,12 @@ impl ResponseMethods for Response {
     fn Json(&self) -> Rc<Promise> {
         consume_body(self, BodyType::Json)
     }
+
+    #[allow(unrooted_must_root)]
+    // https://fetch.spec.whatwg.org/#dom-body-arraybuffer
+    fn ArrayBuffer(&self) -> Rc<Promise> {
+        consume_body(self, BodyType::ArrayBuffer)
+    }
 }
 
 fn serialize_without_fragment(url: &ServoUrl) -> &str {

components/script/dom/webidls/Body.webidl

@@ -10,7 +10,7 @@
 interface Body {
   readonly attribute boolean bodyUsed;
 
-  // [NewObject] Promise<ArrayBuffer> arrayBuffer();
+  [NewObject] Promise<ArrayBuffer> arrayBuffer();
   [NewObject] Promise<Blob> blob();
   [NewObject] Promise<FormData> formData();
   [NewObject] Promise<any> json();