Use refs for GraphicsContext

third_party/WebKit/Source/core/paint/BoxPainter.h

Index: third_party/WebKit/Source/core/paint/BoxPainter.h
diff --git a/third_party/WebKit/Source/core/paint/BoxPainter.h b/third_party/WebKit/Source/core/paint/BoxPainter.h
index 09852b21d0fcb0d2ca8a69ebe9245c4fc1c09f51..438beca4ad3f2a72959d521127d59c227e97ef50 100644
--- a/third_party/WebKit/Source/core/paint/BoxPainter.h
+++ b/third_party/WebKit/Source/core/paint/BoxPainter.h
@@ -38,8 +38,8 @@ public:
     void paintMaskImages(const PaintInfo&, const LayoutRect&);
     void paintBoxDecorationBackgroundWithRect(const PaintInfo&, const LayoutPoint&, const LayoutRect&);
     static void paintFillLayerExtended(const LayoutBoxModelObject&, const PaintInfo&, const Color&, const FillLayer&, const LayoutRect&, BackgroundBleedAvoidance, const InlineFlowBox* = nullptr, const LayoutSize& = LayoutSize(), SkXfermode::Mode = SkXfermode::kSrcOver_Mode, const LayoutObject* backgroundObject = nullptr);
-    static InterpolationQuality chooseInterpolationQuality(const LayoutObject&, GraphicsContext*, Image*, const void*, const LayoutSize&);
-    static bool paintNinePieceImage(const LayoutBoxModelObject&, GraphicsContext*, const LayoutRect&, const ComputedStyle&, const NinePieceImage&, SkXfermode::Mode = SkXfermode::kSrcOver_Mode);
+    static InterpolationQuality chooseInterpolationQuality(const LayoutObject&, Image*, const void*, const LayoutSize&);
+    static bool paintNinePieceImage(const LayoutBoxModelObject&, GraphicsContext&, const LayoutRect&, const ComputedStyle&, const NinePieceImage&, SkXfermode::Mode = SkXfermode::kSrcOver_Mode);
     static void paintBorder(const LayoutBoxModelObject&, const PaintInfo&, const LayoutRect&, const ComputedStyle&, BackgroundBleedAvoidance = BackgroundBleedNone, bool includeLogicalLeftEdge = true, bool includeLogicalRightEdge = true);
     static void paintBoxShadow(const PaintInfo&, const LayoutRect&, const ComputedStyle&, ShadowStyle, bool includeLogicalLeftEdge = true, bool includeLogicalRightEdge = true);
     static bool shouldForceWhiteBackgroundForPrintEconomy(const ComputedStyle&, const Document&);
@@ -50,7 +50,7 @@ private:
     static FloatRoundedRect backgroundRoundedRectAdjustedForBleedAvoidance(const LayoutObject&, const LayoutRect&, BackgroundBleedAvoidance, const InlineFlowBox*, const LayoutSize&, bool includeLogicalLeftEdge, bool includeLogicalRightEdge);
     static FloatRoundedRect getBackgroundRoundedRect(const LayoutObject&, const LayoutRect&, const InlineFlowBox*, LayoutUnit inlineBoxWidth, LayoutUnit inlineBoxHeight,
         bool includeLogicalLeftEdge, bool includeLogicalRightEdge);
-    static void applyBoxShadowForBackground(GraphicsContext*, const LayoutObject&);
+    static void applyBoxShadowForBackground(GraphicsContext&, const LayoutObject&);
 
     LayoutRect boundsForDrawingRecorder(const LayoutPoint& paintOffset);