Adding Size() to AbstractFileEnumerator

webkit/fileapi/file_system_file_util.h

 // Copyright (c) 2011 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_FILEAPI_FILE_SYSTEM_FILE_UTIL_H_
 #define WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_H_
 
 #include "base/callback.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
@@ skipping 204 matching lines @@
       const FilePath& file_path);
 
   // It will be implemented by each subclass such as FileSystemFileEnumerator.
   class AbstractFileEnumerator {
    public:
     virtual ~AbstractFileEnumerator() {}
 
     // Returns an empty string if there are no more results.
     virtual FilePath Next() = 0;
 
+    virtual int64 Size() = 0;
     virtual bool IsDirectory() = 0;
   };
 
   class EmptyFileEnumerator : public AbstractFileEnumerator {
-    virtual FilePath Next() { return FilePath(); }
-    virtual bool IsDirectory() { return false; }
+    virtual FilePath Next() OVERRIDE { return FilePath(); }
+    virtual int64 Size() OVERRIDE { return 0; }
+    virtual bool IsDirectory() OVERRIDE { return false; }
   };
 
   // Returns a pointer to a new instance of AbstractFileEnumerator which is
   // implemented for each FileUtil subclass. The instance needs to be freed
   // by the caller, and its lifetime should not extend past when the current
   // call returns to the main FILE message loop.
   virtual AbstractFileEnumerator* CreateFileEnumerator(
       FileSystemOperationContext* unused,
       const FilePath& root_path);
 
@@ skipping 36 matching lines @@
       const FilePath& src_file_path,
       const FilePath& dest_file_path,
       bool copy);
 
   DISALLOW_COPY_AND_ASSIGN(FileSystemFileUtil);
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_H_