Sync FS crashy extension test

telemetry/telemetry/internal/testing/crash_extension/worker.js

Index: telemetry/telemetry/internal/testing/crash_extension/worker.js
diff --git a/telemetry/telemetry/internal/testing/crash_extension/worker.js b/telemetry/telemetry/internal/testing/crash_extension/worker.js
new file mode 100644
index 0000000000000000000000000000000000000000..c587f1b96dd09be01bd97077936ccf5a6c5832bb
--- /dev/null
+++ b/telemetry/telemetry/internal/testing/crash_extension/worker.js
@@ -0,0 +1,21 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+'use strict';
+
+console.log('hello worker');
+var chromeFilesystem = webkitRequestFileSystemSync(
+    PERSISTENT, 500 * 1024 * 1024);
+try {
+  for (var i = 0; i < 1000; i++) {
+    var fileName = 'test' + i;
+    var directoryEntry = chromeFilesystem.root;
+    var fileEntry = directoryEntry.getFile(fileName, {create: true});
+    var writer = fileEntry.createWriter();
+    if ((i % 100) === 0) console.log('created:', i);
+  }
+  console.log('created all');
+} catch (ex) {
+  console.warn(ex.name, ex.message);
+}