Move SkPaint mangement for 2D canvas into CanvasRenderingContext2DState

Source/platform/graphics/skia/SkiaUtils.h

 /*
  * Copyright (c) 2006,2007,2008, Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 111 matching lines @@
 InterpolationQuality computeInterpolationQuality(
     const SkMatrix&,
     float srcWidth,
     float srcHeight,
     float destWidth,
     float destHeight,
     bool isDataComplete = true);
 
 bool shouldDrawAntiAliased(const GraphicsContext*, const SkRect& destRect);
 
+// This replicates the old skia behavior when it used to take radius for blur. Now it takes sigma.
+inline SkScalar skBlurRadiusToSigma(SkScalar radius)
+{
+    SkASSERT(radius > 0);
+    return 0.288675f * radius + 0.5f;
+}
+
 } // namespace blink
 
 #endif  // SkiaUtils_h