Make SVG painting independent of GraphicsContext's alpha state

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/paint/RenderDrawingRecorder.h"
 #include "core/paint/SVGInlineFlowBoxPainter.h"
 #include "core/paint/SVGInlineTextBoxPainter.h"
 #include "core/rendering/PaintInfo.h"
 #include "core/rendering/svg/SVGInlineFlowBox.h"
 #include "core/rendering/svg/SVGInlineTextBox.h"
 #include "core/rendering/svg/SVGRenderingContext.h"
 #include "core/rendering/svg/SVGRootInlineBox.h"
-#include "platform/graphics/GraphicsContextStateSaver.h"
 
 namespace blink {
 
 void SVGRootInlineBoxPainter::paint(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
     ASSERT(paintInfo.phase == PaintPhaseForeground || paintInfo.phase == PaintPhaseSelection);
 
     bool isPrinting = m_svgRootInlineBox.renderer().document().printing();
     bool hasSelection = !isPrinting && m_svgRootInlineBox.selectionState() != RenderObject::SelectionNone;
 
     PaintInfo paintInfoBeforeFiltering(paintInfo);
     if (hasSelection) {
         RenderDrawingRecorder recorder(paintInfoBeforeFiltering.context, m_svgRootInlineBox.renderer(), paintInfoBeforeFiltering.phase, paintInfoBeforeFiltering.rect);
         if (!recorder.canUseCachedDrawing()) {
             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);
             }
         }
     }
 
-    // FIXME: Remove this state saver when SVGRenderSupport::updateGraphicsContext
-    // no longer affects the global alpha state. See crbug.com/453225
-    GraphicsContextStateSaver stateSaver(*paintInfoBeforeFiltering.context);
-
     SVGRenderingContext renderingContext(m_svgRootInlineBox.renderer(), paintInfoBeforeFiltering);
     if (renderingContext.applyClipMaskAndFilterIfNecessary()) {
         for (InlineBox* child = m_svgRootInlineBox.firstChild(); child; child = child->nextOnLine())
             child->paint(renderingContext.paintInfo(), paintOffset, 0, 0);
     }
 }
 
 } // namespace blink