Adds callbacks to notify progress into Copy's API.

chrome/browser/chromeos/extensions/file_manager/private_api_file_system.cc

Index: chrome/browser/chromeos/extensions/file_manager/private_api_file_system.cc
diff --git a/chrome/browser/chromeos/extensions/file_manager/private_api_file_system.cc b/chrome/browser/chromeos/extensions/file_manager/private_api_file_system.cc
index 9e45c4ada2b27d71cef07584a6533b61f2e63ee2..80a49b1a4873a80cc74b185d28a55f7d54499efa 100644
--- a/chrome/browser/chromeos/extensions/file_manager/private_api_file_system.cc
+++ b/chrome/browser/chromeos/extensions/file_manager/private_api_file_system.cc
@@ -229,6 +229,7 @@ fileapi::FileSystemOperationRunner::OperationID StartCopyOnIOThread(
       new fileapi::FileSystemOperationRunner::OperationID;
   *operation_id = file_system_context->operation_runner()->Copy(
       source_url, dest_url,
+      fileapi::FileSystemOperationRunner::CopyProgressCallback(),
       base::Bind(&OnCopyCompleted,
                  profile_id, base::Owned(operation_id), dest_url));
   return *operation_id;