Add WritableStream.close()

baselines/dom.generated.d.ts

@@ -18827,6 +18827,7 @@ declare var Worklet: {
 interface WritableStream<W = any> {
     readonly locked: boolean;
     abort(reason?: any): Promise<void>;
+    close(): Promise<void>;
     getWriter(): WritableStreamDefaultWriter<W>;
 }
 

baselines/webworker.generated.d.ts

@@ -5469,6 +5469,7 @@ interface WorkerUtils extends WindowBase64 {
 interface WritableStream<W = any> {
     readonly locked: boolean;
     abort(reason?: any): Promise<void>;
+    close(): Promise<void>;
     getWriter(): WritableStreamDefaultWriter<W>;
 }
 

inputfiles/idl/Streams.widl

@@ -114,6 +114,7 @@ interface ReadableStreamBYOBRequest {
 interface WritableStream {
     readonly attribute boolean locked;
     Promise<void> abort(optional any reason);
+    Promise<void> close();
     WritableStreamDefaultWriter getWriter();
 };