Add sk_sp helpers and switch Blink SkShader clients to the new APIs

third_party/WebKit/Source/core/layout/svg/LayoutSVGResourcePattern.cpp

 /*
  * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  * Copyright 2014 The Chromium Authors. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 161 matching lines @@
             break;
         if (linkedResource == expectedLayoutObject)
             return expectedLayoutObject;
         contentLayoutObject = linkedResource;
     }
     // There was a cycle, just use this resource as the "content resource" even
     // though it will be empty (have no children).
     return this;
 }
 
-PassRefPtr<const SkPicture> LayoutSVGResourcePattern::asPicture(const FloatRect& tileBounds,
+PassRefPtr<SkPicture> LayoutSVGResourcePattern::asPicture(const FloatRect& tileBounds,
     const AffineTransform& tileTransform) const
 {
     ASSERT(!m_shouldCollectPatternAttributes);
 
     AffineTransform contentTransform;
     if (attributes().patternContentUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX)
         contentTransform = tileTransform;
 
     FloatRect bounds(FloatPoint(), tileBounds.size());
     SkPictureBuilder pictureBuilder(bounds);
 
     const LayoutSVGResourceContainer* patternLayoutObject = resolveContentElement();
     ASSERT(patternLayoutObject && !patternLayoutObject->needsLayout());
 
     SubtreeContentTransformScope contentTransformScope(contentTransform);
 
     {
         TransformRecorder transformRecorder(pictureBuilder.context(), *patternLayoutObject, tileTransform);
         for (LayoutObject* child = patternLayoutObject->firstChild(); child; child = child->nextSibling())
             SVGPaintContext::paintSubtree(pictureBuilder.context(), child);
     }
 
     return pictureBuilder.endRecording();
 }
 
 } // namespace blink