[css-align] New CSS Value 'normal' for Self Alignment

third_party/WebKit/Source/core/layout/LayoutFullScreen.h

 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 42 matching lines @@
 
     // Must call setStyleWithWritingModeOfParent() instead.
     void setStyle(PassRefPtr<ComputedStyle>) = delete;
 
 private:
     LayoutFullScreen();
     void willBeDestroyed() override;
 
 protected:
     LayoutBlockFlow* m_placeholder;
+    ItemPosition selfAlignmentNormalBehavior() const override { return ItemPositionCenter; }
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutFullScreen, isLayoutFullScreen());
 
 } // namespace blink
 
 #endif