Implement a paint offset cache for slimming paint v2

Source/core/paint/BlockFlowPainter.cpp

Index: Source/core/paint/BlockFlowPainter.cpp
diff --git a/Source/core/paint/BlockFlowPainter.cpp b/Source/core/paint/BlockFlowPainter.cpp
index 95963c2fca7afd6220ecf355ad998b17cbe5bb57..3ae78d194448c855bf67333d470bb1c6663cfb0b 100644
--- a/Source/core/paint/BlockFlowPainter.cpp
+++ b/Source/core/paint/BlockFlowPainter.cpp
@@ -64,11 +64,11 @@ void BlockFlowPainter::paintSelection(const PaintInfo& paintInfo, const LayoutPo
 
     // Only create a DrawingRecorder and ClipScope if skipRecording is false. This logic is needed
     // because selectionGaps(...) needs to be called even when we do not record.
-    bool skipRecording = LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(*paintInfo.context, m_layoutBlockFlow, DisplayItem::SelectionGap);
+    bool skipRecording = LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(*paintInfo.context, m_layoutBlockFlow, DisplayItem::SelectionGap, paintOffset);
     Optional<LayoutObjectDrawingRecorder> drawingRecorder;
     Optional<ClipScope> clipScope;
     if (!skipRecording) {
-        drawingRecorder.emplace(*paintInfo.context, m_layoutBlockFlow, DisplayItem::SelectionGap, FloatRect(bounds));
+        drawingRecorder.emplace(*paintInfo.context, m_layoutBlockFlow, DisplayItem::SelectionGap, FloatRect(bounds), paintOffset);
         clipScope.emplace(paintInfo.context);
     }