Add ScrollEnums.h, so that PaintLayerScrollableArea.h doesn't have to include LayoutBox.h

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2006, 2007 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef LayoutBox_h
 #define LayoutBox_h
 
 #include "core/CoreExport.h"
 #include "core/layout/LayoutBoxModelObject.h"
 #include "core/layout/OverflowModel.h"
+#include "core/layout/ScrollEnums.h"
 #include "platform/scroll/ScrollTypes.h"
 #include "platform/scroll/ScrollableArea.h"
 
 namespace blink {
 
 class LayoutBlockFlow;
 class LayoutMultiColumnSpannerPlaceholder;
 class ShapeOutsideInfo;
 
 struct PaintInfo;
 
 enum SizeType { MainOrPreferredSize, MinSize, MaxSize };
 enum AvailableLogicalHeightType { ExcludeMarginBorderPadding, IncludeMarginBorderPadding };
 // When painting, overlay scrollbars do not take up space and should not affect
 // clipping behavior. During hit testing, overlay scrollbars behave like regular
 // scrollbars and should change how hit testing is clipped.
-enum OverlayScrollbarClipBehavior { IgnoreOverlayScrollbarSize, ExcludeOverlayScrollbarSizeForHitTesting };
 enum MarginDirection { BlockDirection, InlineDirection };
 
 enum ShouldComputePreferred { ComputeActual, ComputePreferred };
 
-enum ScrollOffsetClamping {
-    ScrollOffsetUnclamped,
-    ScrollOffsetClamped
-};
-
 enum ApplyOverflowClipFlag {
     ApplyOverflowClip,
     ApplyNonScrollOverflowClip
 };
 
 using SnapAreaSet = HashSet<const LayoutBox*>;
 
 struct LayoutBoxRareData {
     WTF_MAKE_NONCOPYABLE(LayoutBoxRareData); USING_FAST_MALLOC(LayoutBoxRareData);
 public:
@@ skipping 1153 matching lines @@
         || breakValue == BreakLeft
         || breakValue == BreakPage
         || breakValue == BreakRecto
         || breakValue == BreakRight
         || breakValue == BreakVerso;
 }
 
 } // namespace blink
 
 #endif // LayoutBox_h