[ew] Move operation observers from QuotaUtil to FileSystemBackend.

storage/browser/fileapi/file_system_backend.h

 // Copyright (c) 2012 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 STORAGE_BROWSER_FILEAPI_FILE_SYSTEM_BACKEND_H_
 #define STORAGE_BROWSER_FILEAPI_FILE_SYSTEM_BACKEND_H_
 
 #include <string>
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/files/file.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "storage/browser/fileapi/file_permission_policy.h"
 #include "storage/browser/fileapi/open_file_system_mode.h"
+#include "storage/browser/fileapi/task_runner_bound_observer_list.h"
 #include "storage/browser/storage_browser_export.h"
 #include "storage/common/fileapi/file_system_types.h"
 
 class GURL;
 
 namespace storage {
 
 class AsyncFileUtil;
 class CopyOrMoveFileValidatorFactory;
 class FileSystemURL;
@@ skipping 95 matching lines @@
   // This method itself does *not* check if the given path exists and is a
   // regular file.
   virtual scoped_ptr<FileStreamWriter> CreateFileStreamWriter(
       const FileSystemURL& url,
       int64 offset,
       FileSystemContext* context) const = 0;
 
   // Returns the specialized FileSystemQuotaUtil for this backend.
   // This could return NULL if this backend does not support quota.
   virtual FileSystemQuotaUtil* GetQuotaUtil() = 0;
+
+  // Returns the update observer list for |type|. It may return NULL when no
+  // observers are added.
+  virtual const UpdateObserverList* GetUpdateObservers(
+      FileSystemType type) const = 0;
+
+  // Returns the change observer list for |type|. It may return NULL when no
+  // observers are added.
+  virtual const ChangeObserverList* GetChangeObservers(
+      FileSystemType type) const = 0;
+
+  // Returns the access observer list for |type|. It may return NULL when no
+  // observers are added.
+  virtual const AccessObserverList* GetAccessObservers(
+      FileSystemType type) const = 0;
 };
 
 // An interface to control external file system access permissions.
 // TODO(satorux): Move this out of 'storage/browser/fileapi'. crbug.com/257279
 class ExternalFileSystemBackend : public FileSystemBackend {
  public:
   // Returns true if |url| is allowed to be accessed.
   // This is supposed to perform ExternalFileSystem-specific security
   // checks.
   virtual bool IsAccessAllowed(const storage::FileSystemURL& url) const = 0;
@@ skipping 18 matching lines @@
   // Gets a redirect URL for contents. e.g. Google Drive URL for hosted
   // documents. Returns empty URL if the entry does not have the redirect URL.
   virtual void GetRedirectURLForContents(
       const storage::FileSystemURL& url,
       const storage::URLCallback& callback) = 0;
 };
 
 }  // namespace storage
 
 #endif  // STORAGE_BROWSER_FILEAPI_FILE_SYSTEM_BACKEND_H_