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diff --git a/chromium/content/browser/fileapi/mock_file_change_observer.h b/chromium/content/browser/fileapi/mock_file_change_observer.h
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+++ b/chromium/content/browser/fileapi/mock_file_change_observer.h
@@ -0,0 +1,103 @@
+// 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_CHANGE_OBSERVER_H_
+#define WEBKIT_BROWSER_FILEAPI_MOCK_FILE_CHANGE_OBSERVER_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "webkit/browser/fileapi/file_observers.h"
+#include "webkit/browser/fileapi/file_system_url.h"
+#include "webkit/browser/fileapi/task_runner_bound_observer_list.h"
+
+namespace fileapi {
+
+// Mock file change observer.
+class MockFileChangeObserver : public FileChangeObserver {
+ public:
+  MockFileChangeObserver();
+  virtual ~MockFileChangeObserver();
+
+  // Creates a ChangeObserverList which only contains given |observer|.
+  static ChangeObserverList CreateList(MockFileChangeObserver* observer);
+
+  // FileChangeObserver overrides.
+  virtual void OnCreateFile(const FileSystemURL& url) OVERRIDE;
+  virtual void OnCreateFileFrom(const FileSystemURL& url,
+                                const FileSystemURL& src) OVERRIDE;
+  virtual void OnRemoveFile(const FileSystemURL& url) OVERRIDE;
+  virtual void OnModifyFile(const FileSystemURL& url) OVERRIDE;
+  virtual void OnCreateDirectory(const FileSystemURL& url) OVERRIDE;
+  virtual void OnRemoveDirectory(const FileSystemURL& url) OVERRIDE;
+
+  void ResetCount() {
+    create_file_count_ = 0;
+    create_file_from_count_ = 0;
+    remove_file_count_ = 0;
+    modify_file_count_ = 0;
+    create_directory_count_ = 0;
+    remove_directory_count_ = 0;
+  }
+
+  bool HasNoChange() const {
+    return create_file_count_ == 0 &&
+           create_file_from_count_ == 0 &&
+           remove_file_count_ == 0 &&
+           modify_file_count_ == 0 &&
+           create_directory_count_ == 0 &&
+           remove_directory_count_ == 0;
+  }
+
+  int create_file_count() const { return create_file_count_; }
+  int create_file_from_count() const { return create_file_from_count_; }
+  int remove_file_count() const { return remove_file_count_; }
+  int modify_file_count() const { return modify_file_count_; }
+  int create_directory_count() const { return create_directory_count_; }
+  int remove_directory_count() const { return remove_directory_count_; }
+
+  int get_and_reset_create_file_count() {
+    int tmp = create_file_count_;
+    create_file_count_ = 0;
+    return tmp;
+  }
+  int get_and_reset_create_file_from_count() {
+    int tmp = create_file_from_count_;
+    create_file_from_count_ = 0;
+    return tmp;
+  }
+  int get_and_reset_remove_file_count() {
+    int tmp = remove_file_count_;
+    remove_file_count_ = 0;
+    return tmp;
+  }
+  int get_and_reset_modify_file_count() {
+    int tmp = modify_file_count_;
+    modify_file_count_ = 0;
+    return tmp;
+  }
+  int get_and_reset_create_directory_count() {
+    int tmp = create_directory_count_;
+    create_directory_count_ = 0;
+    return tmp;
+  }
+  int get_and_reset_remove_directory_count() {
+    int tmp = remove_directory_count_;
+    remove_directory_count_ = 0;
+    return tmp;
+  }
+
+ private:
+  int create_file_count_;
+  int create_file_from_count_;
+  int remove_file_count_;
+  int modify_file_count_;
+  int create_directory_count_;
+  int remove_directory_count_;
+
+  DISALLOW_COPY_AND_ASSIGN(MockFileChangeObserver);
+};
+
+}  // namespace fileapi
+
+#endif  // WEBKIT_BROWSER_FILEAPI_MOCK_FILE_CHANGE_OBSERVER_H_