Add update observer to file_system_operation_impl_unittest for

content/browser/fileapi/mock_file_update_observer.h

Index: content/browser/fileapi/mock_file_update_observer.h
diff --git a/content/browser/fileapi/mock_file_update_observer.h b/content/browser/fileapi/mock_file_update_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..9f0ffef7cd908e545e890df9e7b790cff397aa45
--- /dev/null
+++ b/content/browser/fileapi/mock_file_update_observer.h
@@ -0,0 +1,50 @@
+// 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.
+
+#ifndef WEBKIT_BROWSER_FILEAPI_MOCK_FILE_UPDATE_OBSERVER_H_
+#define WEBKIT_BROWSER_FILEAPI_MOCK_FILE_UPDATE_OBSERVER_H_
+
+#include <map>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "storage/browser/fileapi/file_observers.h"
+#include "storage/browser/fileapi/file_system_url.h"
+#include "storage/browser/fileapi/task_runner_bound_observer_list.h"
+
+namespace storage {
+
+// Mock file change observer.
+class MockFileUpdateObserver : public FileUpdateObserver {
+ public:
+  MockFileUpdateObserver();
+  virtual ~MockFileUpdateObserver();
+
+  // Creates a ChangeObserverList which only contains given |observer|.
+  static UpdateObserverList CreateList(MockFileUpdateObserver* observer);
+
+  // FileUpdateObserver overrides.
+  virtual void OnStartUpdate(const FileSystemURL& url) OVERRIDE;
+  virtual void OnUpdate(const FileSystemURL& url, int64 delta) OVERRIDE;
+  virtual void OnEndUpdate(const FileSystemURL& url) OVERRIDE;
+
+  void Enable() { is_ready_ = true; }
+
+  void Disable() {
+    start_update_count_.clear();
+    end_update_count_.clear();
+    is_ready_ = false;
+  }
+
+ private:
+  std::map<FileSystemURL, int, FileSystemURL::Comparator> start_update_count_;
+  std::map<FileSystemURL, int, FileSystemURL::Comparator> end_update_count_;
+  bool is_ready_;
+
+  DISALLOW_COPY_AND_ASSIGN(MockFileUpdateObserver);
+};
+
+}  // namespace storage
+
+#endif  // WEBKIT_BROWSER_FILEAPI_MOCK_FILE_UPDATE_OBSERVER_H_