Add CSS support for Containment

third_party/WebKit/Source/core/style/StyleRareNonInheritedData.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * 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
@@ skipping 171 matching lines @@
     unsigned m_runningBackdropFilterAnimationOnCompositor : 1;
 
     unsigned m_effectiveBlendMode: 5; // EBlendMode
 
     unsigned m_touchAction : TouchActionBits; // TouchAction
 
     unsigned m_objectFit : 3; // ObjectFit
 
     unsigned m_isolation : 1; // Isolation
 
+    unsigned m_contain : 3; // Containment
+
     // ScrollBehavior. 'scroll-behavior' has 2 accepted values, but ScrollBehavior has a third
     // value (that can only be specified using CSSOM scroll APIs) so 2 bits are needed.
     unsigned m_scrollBehavior: 2;
 
     unsigned m_scrollSnapType: 2; // ScrollSnapType
 
     // Plugins require accelerated compositing for reasons external to blink.
     // In which case, we need to update the ComputedStyle on the LayoutEmbeddedObject,
     // so store this bit so that the style actually changes when the plugin
     // becomes composited.
     unsigned m_requiresAcceleratedCompositingForExternalReasons: 1;
 
     // Whether the transform (if it exists) is stored in the element's inline style.
     unsigned m_hasInlineTransform : 1;
     unsigned m_resize : 2; // EResize
     unsigned m_hasCompositorProxy : 1;
 
     // Style adjustment for appearance is disabled when certain properties are set.
     unsigned m_hasAuthorBackground : 1; // Whether there is a author-defined background.
     unsigned m_hasAuthorBorder : 1; // Whether there is a author-defined border.
 
 private:
     StyleRareNonInheritedData();
     StyleRareNonInheritedData(const StyleRareNonInheritedData&);
 };
 
 } // namespace blink
 
 #endif // StyleRareNonInheritedData_h