Implement a paint offset cache for slimming paint v2

Source/core/paint/SVGRootInlineBoxPainter.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/SVGRootInlineBoxPainter.h"
 
 #include "core/layout/api/SelectionState.h"
 #include "core/layout/svg/line/SVGInlineFlowBox.h"
 #include "core/layout/svg/line/SVGInlineTextBox.h"
 #include "core/layout/svg/line/SVGRootInlineBox.h"
 #include "core/paint/LayoutObjectDrawingRecorder.h"
 #include "core/paint/PaintInfo.h"
 #include "core/paint/SVGInlineFlowBoxPainter.h"
 #include "core/paint/SVGInlineTextBoxPainter.h"
 #include "core/paint/SVGPaintContext.h"
 
 namespace blink {
 
 void SVGRootInlineBoxPainter::paint(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
     ASSERT(paintInfo.phase == PaintPhaseForeground || paintInfo.phase == PaintPhaseSelection);
 
     bool hasSelection = !paintInfo.isPrinting() && m_svgRootInlineBox.selectionState() != SelectionNone;
 
     PaintInfo paintInfoBeforeFiltering(paintInfo);
-    if (hasSelection && !LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(*paintInfoBeforeFiltering.context, m_svgRootInlineBox.layoutObject(), paintInfoBeforeFiltering.phase)) {
-        LayoutObjectDrawingRecorder recorder(*paintInfoBeforeFiltering.context, m_svgRootInlineBox.layoutObject(), paintInfoBeforeFiltering.phase, paintInfoBeforeFiltering.rect);
+    if (hasSelection && !LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(*paintInfoBeforeFiltering.context, m_svgRootInlineBox.layoutObject(), paintInfoBeforeFiltering.phase, paintOffset)) {
+        LayoutObjectDrawingRecorder recorder(*paintInfoBeforeFiltering.context, m_svgRootInlineBox.layoutObject(), paintInfoBeforeFiltering.phase, paintInfoBeforeFiltering.rect, paintOffset);
         for (InlineBox* child = m_svgRootInlineBox.firstChild(); child; child = child->nextOnLine()) {
             if (child->isSVGInlineTextBox())
                 SVGInlineTextBoxPainter(*toSVGInlineTextBox(child)).paintSelectionBackground(paintInfoBeforeFiltering);
             else if (child->isSVGInlineFlowBox())
                 SVGInlineFlowBoxPainter(*toSVGInlineFlowBox(child)).paintSelectionBackground(paintInfoBeforeFiltering);
         }
     }
 
     SVGPaintContext paintContext(m_svgRootInlineBox.layoutObject(), paintInfoBeforeFiltering);
     if (paintContext.applyClipMaskAndFilterIfNecessary()) {
         for (InlineBox* child = m_svgRootInlineBox.firstChild(); child; child = child->nextOnLine())
             child->paint(paintContext.paintInfo(), paintOffset, 0, 0);
     }
 }
 
 } // namespace blink