Use SkLayerDrawLooper::Builder to construct SkLayerDrawLooper.

ui/gfx/skia_util.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gfx/skia_util.h"
 
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkColorFilter.h"
 #include "third_party/skia/include/core/SkColorPriv.h"
 #include "third_party/skia/include/core/SkUnPreMultiply.h"
@@ skipping 86 matching lines @@
 
   return skia::AdoptRef(SkGradientShader::CreateLinear(
       grad_points, grad_colors, NULL, 2, SkShader::kRepeat_TileMode));
 }
 
 skia::RefPtr<SkDrawLooper> CreateShadowDrawLooper(
     const std::vector<ShadowValue>& shadows) {
   if (shadows.empty())
     return skia::RefPtr<SkDrawLooper>();
 
-  skia::RefPtr<SkLayerDrawLooper> looper =
-      skia::AdoptRef(new SkLayerDrawLooper);
+  SkLayerDrawLooper::Builder looper_builder;
 
-  looper->addLayer();  // top layer of the original.
+  looper_builder.addLayer();  // top layer of the original.
 
   SkLayerDrawLooper::LayerInfo layer_info;
   layer_info.fPaintBits |= SkLayerDrawLooper::kMaskFilter_Bit;
   layer_info.fPaintBits |= SkLayerDrawLooper::kColorFilter_Bit;
   layer_info.fColorMode = SkXfermode::kSrc_Mode;
 
   for (size_t i = 0; i < shadows.size(); ++i) {
     const ShadowValue& shadow = shadows[i];
 
     layer_info.fOffset.set(SkIntToScalar(shadow.x()),
                            SkIntToScalar(shadow.y()));
 
     // SkBlurMaskFilter's blur radius defines the range to extend the blur from
     // original mask, which is half of blur amount as defined in ShadowValue.
     skia::RefPtr<SkMaskFilter> blur_mask = skia::AdoptRef(
         SkBlurMaskFilter::Create(SkDoubleToScalar(shadow.blur() / 2),
                                  SkBlurMaskFilter::kNormal_BlurStyle,
                                  SkBlurMaskFilter::kHighQuality_BlurFlag));
     skia::RefPtr<SkColorFilter> color_filter = skia::AdoptRef(
         SkColorFilter::CreateModeFilter(shadow.color(),
                                         SkXfermode::kSrcIn_Mode));
 
-    SkPaint* paint = looper->addLayer(layer_info);
+    SkPaint* paint = looper_builder.addLayer(layer_info);
     paint->setMaskFilter(blur_mask.get());
     paint->setColorFilter(color_filter.get());
   }
 
-  return looper;
+  return skia::AdoptRef<SkDrawLooper>(looper_builder.detachLooper());
 }
 
 bool BitmapsAreEqual(const SkBitmap& bitmap1, const SkBitmap& bitmap2) {
   void* addr1 = NULL;
   void* addr2 = NULL;
   size_t size1 = 0;
   size_t size2 = 0;
 
   bitmap1.lockPixels();
   addr1 = bitmap1.getAddr32(0, 0);
@@ skipping 26 matching lines @@
     } else {
       rgba[i + 0] = SkGetPackedR32(pixel_in);
       rgba[i + 1] = SkGetPackedG32(pixel_in);
       rgba[i + 2] = SkGetPackedB32(pixel_in);
       rgba[i + 3] = alpha;
     }
   }
 }
 
 }  // namespace gfx