Plumb file system permission into WebviewGuest.

chrome/test/data/extensions/platform_apps/web_view/filesystem/worker/worker.js

Index: chrome/test/data/extensions/platform_apps/web_view/filesystem/worker/worker.js
diff --git a/chrome/test/data/extensions/platform_apps/web_view/filesystem/worker/worker.js b/chrome/test/data/extensions/platform_apps/web_view/filesystem/worker/worker.js
new file mode 100644
index 0000000000000000000000000000000000000000..e704385920b495a01ae2e133a2faf0bbb03e2c2b
--- /dev/null
+++ b/chrome/test/data/extensions/platform_apps/web_view/filesystem/worker/worker.js
@@ -0,0 +1,39 @@
+// Copyright 2014 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.
+
+self.requestFileSystemSync = self.webkitRequestFileSystemSync ||
+                             self.requestFileSystemSync;
+
+function onError(e) {
+  postMessage({ 'type': 'error', 'msg': e.toString() });
+}
+
+function echoMsg(msg) {
+  postMessage({'type': 'echo', 'msg': msg});
+}
+
+function requestFileSystem() {
+  try {
+    echoMsg("call requetFileSystem");
+    var filesystem = requestFileSystemSync(PERSISTENT, 1024 * 1024 /* 1MB */);
+    var result = filesystem ? 1 : 0;
+    postMessage({'type': 'result', 'msg': result});
+  } catch (e) {
+    onError(e);
+  }
+}
+
+addEventListener('message', function(e) {
+  var data = e.data;
+  switch(data.type) {
+    case 'echo':
+      postMessage({'type': 'echo', 'msg': data.msg});
+      return;
+    case 'requestFileSystem':
+      requestFileSystem();
+      return;
+    default:
+      postMessage({'type': 'error', 'msg': 'UNKNOWN MESSAGE TYPE'});
+  }
+});