WIP: Skeleton for paint offset caching

Source/core/paint/FieldsetPainter.cpp

Index: Source/core/paint/FieldsetPainter.cpp
diff --git a/Source/core/paint/FieldsetPainter.cpp b/Source/core/paint/FieldsetPainter.cpp
index fcbdf8b16b33274fda85ac212f99580a860c9d4e..8c2b20b4b3eae5af03cae4701850ef0b96fc53c2 100644
--- a/Source/core/paint/FieldsetPainter.cpp
+++ b/Source/core/paint/FieldsetPainter.cpp
@@ -24,7 +24,7 @@ void FieldsetPainter::paintBoxDecorationBackground(const PaintInfo& paintInfo, c
     if (!legend)
         return BoxPainter(m_layoutFieldset).paintBoxDecorationBackground(paintInfo, paintOffset);
 
-    if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(*paintInfo.context, m_layoutFieldset, paintInfo.phase))
+    if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(*paintInfo.context, m_layoutFieldset, paintInfo.phase, paintOffset))
         return;
 
     // FIXME: We need to work with "rl" and "bt" block flow directions.  In those
@@ -40,7 +40,7 @@ void FieldsetPainter::paintBoxDecorationBackground(const PaintInfo& paintInfo, c
         paintRect.setX(paintRect.x() + xOff);
     }
 
-    LayoutObjectDrawingRecorder recorder(*paintInfo.context, m_layoutFieldset, paintInfo.phase, pixelSnappedIntRect(paintRect));
+    LayoutObjectDrawingRecorder recorder(*paintInfo.context, m_layoutFieldset, paintInfo.phase, pixelSnappedIntRect(paintRect), paintOffset);
     BoxDecorationData boxDecorationData(m_layoutFieldset);
 
     if (boxDecorationData.bleedAvoidance == BackgroundBleedNone)
@@ -81,7 +81,7 @@ void FieldsetPainter::paintMask(const PaintInfo& paintInfo, const LayoutPoint& p
     if (!legend)
         return BoxPainter(m_layoutFieldset).paintMask(paintInfo, paintOffset);
 
-    if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(*paintInfo.context, m_layoutFieldset, paintInfo.phase))
+    if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(*paintInfo.context, m_layoutFieldset, paintInfo.phase, paintOffset))
         return;
 
     // FIXME: We need to work with "rl" and "bt" block flow directions.  In those
@@ -97,7 +97,7 @@ void FieldsetPainter::paintMask(const PaintInfo& paintInfo, const LayoutPoint& p
         paintRect.move(xOff, 0);
     }
 
-    LayoutObjectDrawingRecorder recorder(*paintInfo.context, m_layoutFieldset, paintInfo.phase, paintRect);
+    LayoutObjectDrawingRecorder recorder(*paintInfo.context, m_layoutFieldset, paintInfo.phase, paintRect, paintOffset);
     BoxPainter(m_layoutFieldset).paintMaskImages(paintInfo, paintRect);
 }