Use refs for GraphicsContext

third_party/WebKit/Source/platform/graphics/CrossfadeGeneratedImage.cpp

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 69 matching lines @@
     canvas->clipRect(dstRect);
     canvas->translate(dstRect.x(), dstRect.y());
     if (dstRect.size() != srcRect.size())
         canvas->scale(dstRect.width() / srcRect.width(), dstRect.height() / srcRect.height());
     canvas->translate(-srcRect.x(), -srcRect.y());
 
     drawCrossfade(canvas, paint, clampMode);
     canvas->restore();
 }
 
-void CrossfadeGeneratedImage::drawTile(GraphicsContext* context, const FloatRect& srcRect)
+void CrossfadeGeneratedImage::drawTile(GraphicsContext& context, const FloatRect& srcRect)
 {
     // Draw nothing if either of the images hasn't loaded yet.
     if (m_fromImage == Image::nullImage() || m_toImage == Image::nullImage())
         return;
 
-    SkPaint paint = context->fillPaint();
+    SkPaint paint = context.fillPaint();
     paint.setXfermodeMode(SkXfermode::kSrcOver_Mode);
-    paint.setAntiAlias(context->shouldAntialias());
+    paint.setAntiAlias(context.shouldAntialias());
     FloatRect destRect((FloatPoint()), FloatSize(m_crossfadeSize));
-    paint.setFilterQuality(context->computeFilterQuality(this, destRect, srcRect));
-    drawCrossfade(context->canvas(), paint, ClampImageToSourceRect);
+    paint.setFilterQuality(context.computeFilterQuality(this, destRect, srcRect));
+    drawCrossfade(context.canvas(), paint, ClampImageToSourceRect);
 }
 
 } // namespace blink