Hook up style invalidation for CSS Paint API.

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 135 matching lines @@
     StyleColor m_visitedLinkTextDecorationColor;
     StyleColor m_visitedLinkBackgroundColor;
     StyleColor m_visitedLinkOutlineColor;
     StyleColor m_visitedLinkBorderLeftColor;
     StyleColor m_visitedLinkBorderRightColor;
     StyleColor m_visitedLinkBorderTopColor;
     StyleColor m_visitedLinkBorderBottomColor;
 
     Vector<String> m_callbackSelectors;
 
+    Vector<Persistent<StyleImage>> m_paintImages;

[rune, 2016/04/29 08:06:37]

It's a bit unfortunate that we store these in the computed style as they're only
needed right after style resolution for diffing. I realize the
StyleResolverState is gone before we do the diff, otherwise that could be a
place to store them. Is the rationale that looking up the known image properties
in the diff like you did before is more expensive? Or that this is just cleaner?

[ikilpatrick, 2016/04/29 22:42:01]

Both, but primarily (slightly) less expensive. Now we just have an empty vector
check, as opposed to walking through the list of all images.

It's not a big gain so can switch back if you like? But seemed better this way.

+
     StyleContentAlignmentData m_alignContent;
     StyleSelfAlignmentData m_alignItems;
     StyleSelfAlignmentData m_alignSelf;
     StyleContentAlignmentData m_justifyContent;
     StyleSelfAlignmentData m_justifyItems;
     StyleSelfAlignmentData m_justifySelf;
 
     unsigned m_pageSizeType : 2; // PageSizeType
     unsigned m_transformStyle3D : 1; // ETransformStyle3D
     unsigned m_backfaceVisibility : 1; // EBackfaceVisibility
@@ skipping 49 matching lines @@
     unsigned m_hasAuthorBorder : 1; // Whether there is a author-defined border.
 
 private:
     StyleRareNonInheritedData();
     StyleRareNonInheritedData(const StyleRareNonInheritedData&);
 };
 
 } // namespace blink
 
 #endif // StyleRareNonInheritedData_h