Use SkLayerDrawLooper::Builder to construct SkLayerDrawLooper.

Source/platform/graphics/GraphicsContext.cpp

Index: Source/platform/graphics/GraphicsContext.cpp
diff --git a/Source/platform/graphics/GraphicsContext.cpp b/Source/platform/graphics/GraphicsContext.cpp
index 6ec5e4130dfe01f38c39a3fe0ce0de214fe7b34b..c141f1754a1317299e3f3760e6ec76b3ba0f522c 100644
--- a/Source/platform/graphics/GraphicsContext.cpp
+++ b/Source/platform/graphics/GraphicsContext.cpp
@@ -337,10 +337,10 @@ void GraphicsContext::setShadow(const FloatSize& offset, float blur, const Color
         return;
     }
 
-    DrawLooper drawLooper;
-    drawLooper.addShadow(offset, blur, color, shadowTransformMode, shadowAlphaMode);
-    drawLooper.addUnmodifiedContent();
-    setDrawLooper(drawLooper);
+    DrawLooper::Builder drawLooperBuilder;
+    drawLooperBuilder.addShadow(offset, blur, color, shadowTransformMode, shadowAlphaMode);
+    drawLooperBuilder.addUnmodifiedContent();
+    setDrawLooper(*drawLooperBuilder.detachDrawLooper().get());
 }
 
 void GraphicsContext::setDrawLooper(const DrawLooper& drawLooper)
@@ -772,10 +772,10 @@ void GraphicsContext::drawInnerShadow(const RoundedRect& rect, const Color& shad
         clip(rect.rect());
     }
 
-    DrawLooper drawLooper;
-    drawLooper.addShadow(shadowOffset, shadowBlur, shadowColor,
+    DrawLooper::Builder drawLooperBuilder;
+    drawLooperBuilder.addShadow(shadowOffset, shadowBlur, shadowColor,
         DrawLooper::ShadowRespectsTransforms, DrawLooper::ShadowIgnoresAlpha);
-    setDrawLooper(drawLooper);
+    setDrawLooper(*drawLooperBuilder.detachDrawLooper().get());
     fillRectWithRoundedHole(outerRect, roundedHole, fillColor);
     restore();
     clearDrawLooper();