(WIP) Paint invalidation for slimming paint v2

Source/core/paint/ViewPainter.cpp

Index: Source/core/paint/ViewPainter.cpp
diff --git a/Source/core/paint/ViewPainter.cpp b/Source/core/paint/ViewPainter.cpp
index c61b13682dbad17cdb166a6e93f08b0d8274b9db..2c9ad7cf7a44c593de12aa4f422eb66331ff544a 100644
--- a/Source/core/paint/ViewPainter.cpp
+++ b/Source/core/paint/ViewPainter.cpp
@@ -25,6 +25,9 @@ void ViewPainter::paint(const PaintInfo& paintInfo, const LayoutPoint& paintOffs
     // LayoutViews should never be called to paint with an offset not on device pixels.
     ASSERT(LayoutPoint(IntPoint(paintOffset.x(), paintOffset.y())) == paintOffset);
 
+    if (RuntimeEnabledFeatures::slimmingPaintV2Enabled())
+        m_layoutView.invalidatePaintIfNeededForSlimmingPaintV2(paintOffset);
+
     m_layoutView.paintObject(paintInfo, paintOffset);
     BlockPainter(m_layoutView).paintOverflowControlsIfNeeded(paintInfo, paintOffset);
 }