browser_test that creates filesystem resources in extension origin

content/public/test/test_fileapi_operation_waiter.h

+// 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.
+
+#ifndef CONTENT_PUBLIC_TEST_TEST_FILEAPI_OPERATION_WAITER_H_
+
+#include <stdint.h>
+
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "base/run_loop.h"
+#include "storage/browser/fileapi/file_observers.h"
+
+namespace storage {
+class FileSystemContext;
+class FileSystemURL;
+}
+
+namespace content {
+
+// Installs a temporary storage::FileUpdateObserver for use in browser tests
+// that need to wait for a specific fileapi operation to complete.
+class TestFileapiOperationWaiter : public storage::FileUpdateObserver {
+ public:
+  explicit TestFileapiOperationWaiter(storage::FileSystemContext* context);
+  ~TestFileapiOperationWaiter() override;
+
+  // Returns true if OnStartUpdate has occurred.
+  bool did_start_update() { return did_start_update_; }
+
+  // Wait for the next OnEndUpdate event.
+  void WaitForEndUpdate();
+
+  // FileUpdateObserver overrides.
+  void OnStartUpdate(const storage::FileSystemURL& url) override;
+  void OnUpdate(const storage::FileSystemURL& url, int64_t delta) override;
+  void OnEndUpdate(const storage::FileSystemURL& url) override;
+
+ private:
+  bool did_start_update_ = false;
+  base::RunLoop run_loop_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestFileapiOperationWaiter);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_TEST_TEST_FILEAPI_OPERATION_WAITER_H_