Bug 1874334 - Add fuzzing finding to OPFS crashtest suite. r=dom-storage-reviewers,janv

Differential Revision: https://phabricator.services.mozilla.com/D204779

dom/fs/test/crashtests/1874334.html

@@ -0,0 +1,16 @@
+<script>
+
+async function stuff() {
+    let arr = new ArrayBuffer(500000);
+    let blob = new Blob([arr]);
+    let file = new File([blob], "", { });
+
+    let dir = await self.navigator.storage.getDirectory();
+    let handle = await dir.getFileHandle("514600c6-596b-4676-ab0c-3e6f1e86759f", {"create": true});
+    let wfs = await handle.createWritable({"keepExistingData": true});
+
+    await file.stream().pipeTo(wfs);
+};
+
+document.addEventListener("DOMContentLoaded", stuff);
+</script>

dom/fs/test/crashtests/crashtests.list

@@ -1,6 +1,7 @@
 # StorageManager isn't enabled on Android
 defaults skip-if(Android) pref(dom.fs.enabled,true) pref(dom.fs.writable_file_stream.enabled,true)
 
+# Most of the issues here are reproducible only with --verify
 load 1798773.html
 load 1800470.html
 load 1809759.html
@@ -8,3 +9,4 @@ load 1816710.html
 load 1841702.html
 HTTP load 1844619.html
 HTTP load 1858820.html
+load 1874334.html