Use SkLayerDrawLooper::Builder to construct SkLayerDrawLooper.

Source/platform/graphics/DrawLooper.cpp

Index: Source/platform/graphics/DrawLooper.cpp
diff --git a/Source/platform/graphics/DrawLooper.cpp b/Source/platform/graphics/DrawLooper.cpp
index 7e32af73feaa58f46031efb5b0aea099ef61749c..08811618fd23e0cbd73aca0d11bf01cd480914db 100644
--- a/Source/platform/graphics/DrawLooper.cpp
+++ b/Source/platform/graphics/DrawLooper.cpp
@@ -39,11 +39,11 @@
 #include "third_party/skia/include/core/SkPaint.h"
 #include "third_party/skia/include/core/SkXfermode.h"
 #include "third_party/skia/include/effects/SkBlurMaskFilter.h"
-#include "third_party/skia/include/effects/SkLayerDrawLooper.h"
+#include "wtf/RefPtr.h"
 
 namespace WebCore {
 
-DrawLooper::DrawLooper() : m_skDrawLooper(adoptRef(new SkLayerDrawLooper)) { }
+DrawLooper::DrawLooper(PassOwnPtr<SkDrawLooper> looper) : m_skDrawLooper(looper) { }
 
 DrawLooper::~DrawLooper() { }
 
@@ -52,13 +52,13 @@ SkDrawLooper* DrawLooper::skDrawLooper() const
     return m_skDrawLooper.get();
 }
 
-void DrawLooper::addUnmodifiedContent()
+void DrawLooper::Builder::addUnmodifiedContent()
 {
     SkLayerDrawLooper::LayerInfo info;
-    m_skDrawLooper->addLayerOnTop(info);
+    m_skDrawLooperBuilder.addLayerOnTop(info);
 }
 
-void DrawLooper::addShadow(const FloatSize& offset, float blur, const Color& color,
+void DrawLooper::Builder::addShadow(const FloatSize& offset, float blur, const Color& color,
     ShadowTransformMode shadowTransformMode, ShadowAlphaMode shadowAlphaMode)
 {
     // Detect when there's no effective shadow.
@@ -86,7 +86,7 @@ void DrawLooper::addShadow(const FloatSize& offset, float blur, const Color& col
     info.fOffset.set(offset.width(), offset.height());
     info.fPostTranslate = (shadowTransformMode == ShadowIgnoresTransforms);
 
-    SkPaint* paint = m_skDrawLooper->addLayerOnTop(info);
+    SkPaint* paint = m_skDrawLooperBuilder.addLayerOnTop(info);
 
     if (blur) {
         uint32_t mfFlags = SkBlurMaskFilter::kHighQuality_BlurFlag;
@@ -101,4 +101,9 @@ void DrawLooper::addShadow(const FloatSize& offset, float blur, const Color& col
     paint->setColorFilter(cf.get());
 }
 
+PassOwnPtr<DrawLooper> DrawLooper::Builder::detachDrawLooper()
+{
+    return adoptPtr(new DrawLooper(adoptPtr(m_skDrawLooperBuilder.detachLooper())));
+}
+
 } // namespace WebCore