Migrates legacy packaged app data when it's upgraded to a platform app

storage/browser/fileapi/sandbox_file_system_backend_delegate.h

Index: storage/browser/fileapi/sandbox_file_system_backend_delegate.h
diff --git a/storage/browser/fileapi/sandbox_file_system_backend_delegate.h b/storage/browser/fileapi/sandbox_file_system_backend_delegate.h
index 88dec7fbb8f99374de812ebed29f0e48f6b34965..214bb235b1b13e7ece1bbbb580e06f688e7e235b 100644
--- a/storage/browser/fileapi/sandbox_file_system_backend_delegate.h
+++ b/storage/browser/fileapi/sandbox_file_system_backend_delegate.h
@@ -174,6 +174,12 @@ class STORAGE_EXPORT SandboxFileSystemBackendDelegate
 
   void CollectOpenFileSystemMetrics(base::File::Error error_code);
 
+  // Used for migrating from the general storage partition to an isolated
+  // storage partition
+  void CopyFileSystem(const GURL& origin_url,
+                      FileSystemType type,
+                      SandboxFileSystemBackendDelegate* destination);
+
   base::SequencedTaskRunner* file_task_runner() {
     return file_task_runner_.get();
   }