browser_test that creates filesystem resources in extension origin

content/browser/fileapi/mock_file_update_observer.h

 // 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 CONTENT_BROWSER_FILEAPI_MOCK_FILE_UPDATE_OBSERVER_H_
 #define CONTENT_BROWSER_FILEAPI_MOCK_FILE_UPDATE_OBSERVER_H_
 
 #include <stdint.h>
 
 #include <map>
 
 #include "base/compiler_specific.h"
 #include "base/macros.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.
+// Mock file change observer for use in unittests.
 class MockFileUpdateObserver : public FileUpdateObserver {
  public:
   MockFileUpdateObserver();
   ~MockFileUpdateObserver() override;
 
   // Creates a ChangeObserverList which only contains given |observer|.
   static UpdateObserverList CreateList(MockFileUpdateObserver* observer);
 
   // FileUpdateObserver overrides.
   void OnStartUpdate(const FileSystemURL& url) override;
@@ skipping 12 matching lines @@
   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  // CONTENT_BROWSER_FILEAPI_MOCK_FILE_UPDATE_OBSERVER_H_