Use SkLayerDrawLooper::Builder to construct SkLayerDrawLooper.

Source/core/rendering/RenderBoxModelObject.cpp

Index: Source/core/rendering/RenderBoxModelObject.cpp
diff --git a/Source/core/rendering/RenderBoxModelObject.cpp b/Source/core/rendering/RenderBoxModelObject.cpp
index 6cb9d71692dbfc4bdb4ff4b268b9309637a62471..87dd6e395aa6222e2636f232c66f3b5ab71d4a9b 100644
--- a/Source/core/rendering/RenderBoxModelObject.cpp
+++ b/Source/core/rendering/RenderBoxModelObject.cpp
@@ -42,7 +42,7 @@
 #include "core/rendering/compositing/RenderLayerCompositor.h"
 #include "core/rendering/style/ShadowList.h"
 #include "platform/geometry/TransformState.h"
-#include "platform/graphics/DrawLooper.h"
+#include "platform/graphics/DrawLooperBuilder.h"
 #include "platform/graphics/GraphicsContextStateSaver.h"
 #include "platform/graphics/Path.h"
 #include "wtf/CurrentTime.h"
@@ -477,7 +477,7 @@ static void applyBoxShadowForBackground(GraphicsContext* context, const RenderOb
             continue;
         FloatSize shadowOffset(boxShadow.x(), boxShadow.y());
         context->setShadow(shadowOffset, boxShadow.blur(), boxShadow.color(),
-            DrawLooper::ShadowRespectsTransforms, DrawLooper::ShadowIgnoresAlpha);
+            DrawLooperBuilder::ShadowRespectsTransforms, DrawLooperBuilder::ShadowIgnoresAlpha);
         return;
     }
 }
@@ -2512,10 +2512,10 @@ void RenderBoxModelObject::paintBoxShadow(const PaintInfo& info, const LayoutRec
             }
 
             // Draw only the shadow.
-            DrawLooper drawLooper;
-            drawLooper.addShadow(shadowOffset, shadowBlur, shadowColor,
-                DrawLooper::ShadowRespectsTransforms, DrawLooper::ShadowIgnoresAlpha);
-            context->setDrawLooper(drawLooper);
+            OwnPtr<DrawLooperBuilder> drawLooperBuilder = DrawLooperBuilder::create();
+            drawLooperBuilder->addShadow(shadowOffset, shadowBlur, shadowColor,
+                DrawLooperBuilder::ShadowRespectsTransforms, DrawLooperBuilder::ShadowIgnoresAlpha);
+            context->setDrawLooper(drawLooperBuilder.release());
 
             if (hasBorderRadius) {
                 RoundedRect influenceRect(pixelSnappedIntRect(LayoutRect(shadowRect)), border.radii());