gdata: Convert GDataFileSystem::AddUploadFile() to asynchronous.

chrome/browser/chromeos/gdata/mock_gdata_file_system.h

Index: chrome/browser/chromeos/gdata/mock_gdata_file_system.h
diff --git a/chrome/browser/chromeos/gdata/mock_gdata_file_system.h b/chrome/browser/chromeos/gdata/mock_gdata_file_system.h
index eded79ac83762e7068b7cf2f6dbdac36c9d34cac..35648f4f49bc6f44fa5ae0566c38f027a472f4a7 100644
--- a/chrome/browser/chromeos/gdata/mock_gdata_file_system.h
+++ b/chrome/browser/chromeos/gdata/mock_gdata_file_system.h
@@ -86,11 +86,12 @@ class MockGDataFileSystem : public GDataFileSystemInterface {
   MOCK_METHOD3(SetPinState, void(const FilePath&,
                                  bool,
                                  const FileOperationCallback& callback));
-  MOCK_METHOD4(AddUploadedFile,
+  MOCK_METHOD5(AddUploadedFile,
                void(const FilePath& file,
                     DocumentEntry* entry,
                     const FilePath& file_content_path,
-                    GDataCache::FileOperationType cache_operation));
+                    GDataCache::FileOperationType cache_operation,
+                    const base::Closure& callback));
 };
 
 }  // namespace gdata