Use refs for GraphicsContext

third_party/WebKit/Source/core/paint/SVGMaskPainter.cpp

Index: third_party/WebKit/Source/core/paint/SVGMaskPainter.cpp
diff --git a/third_party/WebKit/Source/core/paint/SVGMaskPainter.cpp b/third_party/WebKit/Source/core/paint/SVGMaskPainter.cpp
index 53d8f0f0530a4eeb634944452ad9aeb4b0924aca..69184187cb52c5be60a51ccc5be7c7fead9ef895 100644
--- a/third_party/WebKit/Source/core/paint/SVGMaskPainter.cpp
+++ b/third_party/WebKit/Source/core/paint/SVGMaskPainter.cpp
@@ -16,9 +16,8 @@
 
 namespace blink {
 
-bool SVGMaskPainter::prepareEffect(const LayoutObject& object, GraphicsContext* context)
+bool SVGMaskPainter::prepareEffect(const LayoutObject& object, GraphicsContext& context)
 {
-    ASSERT(context);
     ASSERT(m_mask.style());
     ASSERT_WITH_SECURITY_IMPLICATION(!m_mask.needsLayout());
 
@@ -28,13 +27,12 @@ bool SVGMaskPainter::prepareEffect(const LayoutObject& object, GraphicsContext*
     if (paintInvalidationRect.isEmpty() || !m_mask.element()->hasChildren())
         return false;
 
-    context->paintController().createAndAppend<BeginCompositingDisplayItem>(object, SkXfermode::kSrcOver_Mode, 1, &paintInvalidationRect);
+    context.paintController().createAndAppend<BeginCompositingDisplayItem>(object, SkXfermode::kSrcOver_Mode, 1, &paintInvalidationRect);
     return true;
 }
 
-void SVGMaskPainter::finishEffect(const LayoutObject& object, GraphicsContext* context)
+void SVGMaskPainter::finishEffect(const LayoutObject& object, GraphicsContext& context)
 {
-    ASSERT(context);
     ASSERT(m_mask.style());
     ASSERT_WITH_SECURITY_IMPLICATION(!m_mask.needsLayout());
 
@@ -42,28 +40,26 @@ void SVGMaskPainter::finishEffect(const LayoutObject& object, GraphicsContext* c
     {
         ColorFilter maskLayerFilter = m_mask.style()->svgStyle().maskType() == MT_LUMINANCE
             ? ColorFilterLuminanceToAlpha : ColorFilterNone;
-        CompositingRecorder maskCompositing(*context, object, SkXfermode::kDstIn_Mode, 1, &paintInvalidationRect, maskLayerFilter);
+        CompositingRecorder maskCompositing(context, object, SkXfermode::kDstIn_Mode, 1, &paintInvalidationRect, maskLayerFilter);
         drawMaskForLayoutObject(context, object, object.objectBoundingBox(), paintInvalidationRect);
     }
 
-    context->paintController().endItem<EndCompositingDisplayItem>(object);
+    context.paintController().endItem<EndCompositingDisplayItem>(object);
 }
 
-void SVGMaskPainter::drawMaskForLayoutObject(GraphicsContext* context, const LayoutObject& layoutObject, const FloatRect& targetBoundingBox, const FloatRect& targetPaintInvalidationRect)
+void SVGMaskPainter::drawMaskForLayoutObject(GraphicsContext& context, const LayoutObject& layoutObject, const FloatRect& targetBoundingBox, const FloatRect& targetPaintInvalidationRect)
 {
-    ASSERT(context);
-
     AffineTransform contentTransformation;
     RefPtr<const SkPicture> maskContentPicture = m_mask.createContentPicture(contentTransformation, targetBoundingBox, context);
 
-    if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(*context, layoutObject, DisplayItem::SVGMask, LayoutPoint()))
+    if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(context, layoutObject, DisplayItem::SVGMask, LayoutPoint()))
         return;
 
-    LayoutObjectDrawingRecorder drawingRecorder(*context, layoutObject, DisplayItem::SVGMask, targetPaintInvalidationRect, LayoutPoint());
-    context->save();
-    context->concatCTM(contentTransformation);
-    context->drawPicture(maskContentPicture.get());
-    context->restore();
+    LayoutObjectDrawingRecorder drawingRecorder(context, layoutObject, DisplayItem::SVGMask, targetPaintInvalidationRect, LayoutPoint());
+    context.save();
+    context.concatCTM(contentTransformation);
+    context.drawPicture(maskContentPicture.get());
+    context.restore();
 }
 
 }