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..1c376ea6043ffd8042925ff0ed52257c01f09e24 100644
--- a/Source/platform/graphics/DrawLooper.cpp
+++ b/Source/platform/graphics/DrawLooper.cpp
@@ -39,23 +39,22 @@
 #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"
 
 namespace WebCore {
 
-DrawLooper::DrawLooper() : m_skDrawLooper(adoptRef(new SkLayerDrawLooper)) { }
+DrawLooper::DrawLooper() { }
 
 DrawLooper::~DrawLooper() { }
 
-SkDrawLooper* DrawLooper::skDrawLooper() const
+SkDrawLooper* DrawLooper::skDrawLooper()
 {
-    return m_skDrawLooper.get();
+    return m_skDrawLooperBuilder.detachLooper();
 }
 
 void DrawLooper::addUnmodifiedContent()
 {
     SkLayerDrawLooper::LayerInfo info;
-    m_skDrawLooper->addLayerOnTop(info);
+    m_skDrawLooperBuilder.addLayerOnTop(info);
 }
 
 void DrawLooper::addShadow(const FloatSize& offset, float blur, const Color& color,
@@ -86,7 +85,7 @@ 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;