[v8 gc] Introduce a base class for all objects that can have pending activity

third_party/WebKit/Source/modules/fetch/Body.idl

Index: third_party/WebKit/Source/modules/fetch/Body.idl
diff --git a/third_party/WebKit/Source/modules/fetch/Body.idl b/third_party/WebKit/Source/modules/fetch/Body.idl
index f943545d5930a24b2fdbf1f6a9190595b36b8d03..ff61e47672322df2488d42ef22f3c7bae3b7ce47 100644
--- a/third_party/WebKit/Source/modules/fetch/Body.idl
+++ b/third_party/WebKit/Source/modules/fetch/Body.idl
@@ -5,10 +5,11 @@
 // http://fetch.spec.whatwg.org/#body
 typedef object JSON;
 [
-    Exposed=ServiceWorker,
-    NoInterfaceObject,
+    ActiveScriptWrappable,
     DependentLifetime,
+    Exposed=ServiceWorker,
     GarbageCollected,
+    NoInterfaceObject,
 ] interface Body {
     readonly attribute boolean bodyUsed;
     [CallWith=ScriptState] Promise<ArrayBuffer> arrayBuffer();