Let collapsed border drawings be cacheable

Source/core/paint/TablePainter.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/TablePainter.h"
 
 #include "core/layout/LayoutTable.h"
 #include "core/layout/LayoutTableSection.h"
 #include "core/style/CollapsedBorderValue.h"
@@ skipping 36 matching lines @@
         }
     }
 
     if (m_layoutTable.collapseBorders() && paintPhase == PaintPhaseChildBlockBackground && m_layoutTable.style()->visibility() == VISIBLE) {
         // Using our cached sorted styles, we then do individual passes,
         // painting each style of border from lowest precedence to highest precedence.
         info.phase = PaintPhaseCollapsedTableBorders;
         LayoutTable::CollapsedBorderValues collapsedBorders = m_layoutTable.collapsedBorders();
         size_t count = collapsedBorders.size();
         for (size_t i = 0; i < count; ++i) {
-            ScopeRecorder scopeRecorder(*info.context);
             // FIXME: pass this value into children rather than storing temporarily on the LayoutTable object.
             m_layoutTable.setCurrentBorderValue(&collapsedBorders[i]);
             for (LayoutTableSection* section = m_layoutTable.bottomSection(); section; section = m_layoutTable.sectionAbove(section)) {
                 LayoutPoint childPoint = m_layoutTable.flipForWritingModeForChild(section, paintOffset);
                 section->paint(info, childPoint);
             }
         }
         m_layoutTable.setCurrentBorderValue(0);
     }
 
@@ skipping 23 matching lines @@
     if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(*paintInfo.context, m_layoutTable, paintInfo.phase))
         return;
 
     LayoutRect rect(paintOffset, m_layoutTable.size());
     m_layoutTable.subtractCaptionRect(rect);
     LayoutObjectDrawingRecorder recorder(*paintInfo.context, m_layoutTable, paintInfo.phase, pixelSnappedIntRect(rect));
     BoxPainter(m_layoutTable).paintMaskImages(paintInfo, rect);
 }
 
 } // namespace blink