Allow certain SP recorder classes to defer their "begin" operation.

Source/core/paint/PartPainter.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/paint/PartPainter.h"
 
 #include "core/layout/LayoutPart.h"
 #include "core/paint/BoxPainter.h"
 #include "core/paint/DeprecatedPaintLayer.h"
@@ skipping 24 matching lines @@
     LayoutRect visualOverflowRect(m_layoutPart.visualOverflowRect());
     visualOverflowRect.moveBy(adjustedPaintOffset);
 
     if ((paintInfo.phase == PaintPhaseOutline || paintInfo.phase == PaintPhaseSelfOutline) && m_layoutPart.style()->hasOutline())
         ObjectPainter(m_layoutPart).paintOutline(paintInfo, borderRect, visualOverflowRect);
 
     if (paintInfo.phase != PaintPhaseForeground)
         return;
 
     {
-        OwnPtr<RoundedInnerRectClipper> clipper;
+        RoundedInnerRectClipper clipper(m_layoutPart, paintInfo);
         if (m_layoutPart.style()->hasBorderRadius()) {
             if (borderRect.isEmpty())
                 return;
 
             FloatRoundedRect roundedInnerRect = m_layoutPart.style()->getRoundedInnerBorderFor(borderRect,
                 LayoutRectOutsets(
                     -(m_layoutPart.paddingTop() + m_layoutPart.borderTop()),
                     -(m_layoutPart.paddingRight() + m_layoutPart.borderRight()),
                     -(m_layoutPart.paddingBottom() + m_layoutPart.borderBottom()),
                     -(m_layoutPart.paddingLeft() + m_layoutPart.borderLeft())),
                 true, true);
-            clipper = adoptPtr(new RoundedInnerRectClipper(m_layoutPart, paintInfo, borderRect, roundedInnerRect, ApplyToDisplayListIfEnabled));
+            clipper.begin(borderRect, roundedInnerRect, ApplyToDisplayListIfEnabled);
         }
 
         if (m_layoutPart.widget())
             m_layoutPart.paintContents(paintInfo, paintOffset);
     }
 
     // Paint a partially transparent wash over selected widgets.
     if (m_layoutPart.isSelected() && !m_layoutPart.document().printing()) {
         LayoutRect rect = m_layoutPart.localSelectionRect();
         rect.moveBy(adjustedPaintOffset);
@@ skipping 24 matching lines @@
     IntSize widgetPaintOffset = paintLocation - widgetLocation;
     // When painting widgets into compositing layers, tx and ty are relative to the enclosing compositing layer,
     // not the root. In this case, shift the CTM and adjust the paintRect to be root-relative to fix plugin drawing.
     TransformRecorder transform(*paintInfo.context, m_layoutPart,
         AffineTransform::translation(widgetPaintOffset.width(), widgetPaintOffset.height()));
     paintRect.move(-widgetPaintOffset);
     widget->paint(paintInfo.context, paintRect);
 }
 
 } // namespace blink