Use SkLayerDrawLooper::Builder to construct SkLayerDrawLooper.

Source/platform/graphics/GraphicsContext.h

 /*
  * Copyright (C) 2003, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008-2009 Torch Mobile, Inc.
  * Copyright (C) 2013 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 15 matching lines @@
  */
 
 #ifndef GraphicsContext_h
 #define GraphicsContext_h
 
 #include "platform/PlatformExport.h"
 #include "platform/TraceEvent.h"
 #include "platform/fonts/Font.h"
 #include "platform/geometry/FloatRect.h"
 #include "platform/graphics/DashArray.h"
-#include "platform/graphics/DrawLooper.h"
+#include "platform/graphics/DrawLooperBuilder.h"
 #include "platform/graphics/ImageBufferSurface.h"
 #include "platform/graphics/ImageOrientation.h"
 #include "platform/graphics/GraphicsContextAnnotation.h"
 #include "platform/graphics/GraphicsContextState.h"
 #include "platform/graphics/skia/OpaqueRegionSkia.h"
 #include "platform/graphics/skia/SkiaUtils.h"
 #include "wtf/FastAllocBase.h"
 #include "wtf/Forward.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/PassOwnPtr.h"
@@ skipping 260 matching lines @@
     void beginLayer(float opacity, CompositeOperator, const FloatRect* = 0, ColorFilter = ColorFilterNone, ImageFilter* = 0);
     void endLayer();
 
     // Instead of being dispatched to the active canvas, draw commands following beginRecording()
     // are stored in a display list that can be replayed at a later time.
     void beginRecording(const FloatRect& bounds);
     PassRefPtr<DisplayList> endRecording();
 
     bool hasShadow() const;
     void setShadow(const FloatSize& offset, float blur, const Color&,
-        DrawLooper::ShadowTransformMode = DrawLooper::ShadowRespectsTransforms,
-        DrawLooper::ShadowAlphaMode = DrawLooper::ShadowRespectsAlpha);
+        DrawLooperBuilder::ShadowTransformMode = DrawLooperBuilder::ShadowRespectsTransforms,
+        DrawLooperBuilder::ShadowAlphaMode = DrawLooperBuilder::ShadowRespectsAlpha);
     void clearShadow() { clearDrawLooper(); }
 
     // It is assumed that this draw looper is used only for shadows
     // (i.e. a draw looper is set if and only if there is a shadow).
-    void setDrawLooper(const DrawLooper&);
+    // The builder passed into this method will be destroyed.
+    void setDrawLooper(PassOwnPtr<DrawLooperBuilder>);

[Stephen Chennney, 2014/03/03 13:40:48]

The problem was that this should be a PassRefPtr, I think, as the given argument
is then saved in a RefPtr.

[Dominik Grewe, 2014/03/03 13:45:23]

The result of calling detachDrawLooper on the argument (which returns
PassRefPtr) is saved in a RefPtr. The argument itself isn't stored anywhere and
gets destroyed once it's out of scope.

     void clearDrawLooper();
 
     void drawFocusRing(const Vector<IntRect>&, int width, int offset, const Color&);
     void drawFocusRing(const Path&, int width, int offset, const Color&);
 
     enum Edge {
         NoEdge = 0,
         TopEdge = 1 << 1,
         RightEdge = 1 << 2,
         BottomEdge = 1 << 3,
@@ skipping 175 matching lines @@
     // FIXME: Make this go away: crbug.com/236892
     bool m_updatingControlTints : 1;
     bool m_accelerated : 1;
     bool m_isCertainlyOpaque : 1;
     bool m_printing : 1;
 };
 
 } // namespace WebCore
 
 #endif // GraphicsContext_h