First step of PaintInvalidator implementation

third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 30 matching lines @@
 #include "core/layout/LayoutMultiColumnFlowThread.h"
 #include "core/layout/LayoutMultiColumnSpannerPlaceholder.h"
 #include "core/layout/LayoutPagedFlowThread.h"
 #include "core/layout/LayoutView.h"
 #include "core/layout/TextAutosizer.h"
 #include "core/layout/line/GlyphOverflow.h"
 #include "core/layout/line/InlineIterator.h"
 #include "core/layout/line/InlineTextBox.h"
 #include "core/layout/line/LineWidth.h"
 #include "core/layout/shapes/ShapeOutsideInfo.h"
+#include "core/paint/BlockFlowPaintInvalidator.h"
 #include "core/paint/PaintLayer.h"
 #include "wtf/PtrUtil.h"
 #include <memory>
 
 namespace blink {
 
 bool LayoutBlockFlow::s_canPropagateFloatIntoSibling = false;
 
 struct SameSizeAsLayoutBlockFlow : public LayoutBlock {
     LineBoxList lineBoxes;
@@ skipping 3713 matching lines @@
             LayoutRect rect(additionalOffset.x() + curr->x(), additionalOffset.y() + top, curr->width(), bottom - top);
             if (!rect.isEmpty())
                 rects.append(rect);
         }
     }
 
     if (inlineElementContinuation)
         inlineElementContinuation->addOutlineRects(rects, additionalOffset + (inlineElementContinuation->containingBlock()->location() - location()), includeBlockOverflows);
 }
 
+PaintInvalidationReason LayoutBlockFlow::invalidatePaintIfNeeded(const PaintInvalidatorContext& context) const
+{
+    return BlockFlowPaintInvalidator(*this, context).invalidatePaintIfNeeded();
+}
+
 } // namespace blink