Add ScrollDirectionPhysical enum in Scroll types.

Source/core/layout/LayoutEmbeddedObject.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Simon Hausmann <hausmann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 42 matching lines @@
     virtual void paint(const PaintInfo&, const LayoutPoint&) override final;
 
     virtual void layout() override final;
     virtual PaintInvalidationReason invalidatePaintIfNeeded(PaintInvalidationState&, const LayoutBoxModelObject&) override final;
 
     virtual bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectEmbeddedObject || LayoutPart::isOfType(type); }
     virtual LayoutBox* embeddedContentBox() const override final;
 
     virtual DeprecatedPaintLayerType layerTypeRequired() const override final;
 
-    virtual bool scroll(ScrollDirection, ScrollGranularity, float multiplier) override final;
+    virtual bool scroll(ScrollDirectionPhysical, ScrollGranularity, float multiplier) override final;
 
     virtual CompositingReasons additionalCompositingReasons() const override;
 
     bool m_showsUnavailablePluginIndicator;
     PluginUnavailabilityReason m_pluginUnavailabilityReason;
     String m_unavailablePluginReplacementText;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutEmbeddedObject, isEmbeddedObject());
 
 } // namespace blink
 
 #endif // LayoutEmbeddedObject_h