stop using SkXfermode -- use SkBlendMode instead

cc/blimp/layer_tree_host_unittest_serialization.cc

 // Copyright 2015 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 <memory>
 
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
 #include "cc/animation/animation_host.h"
 #include "cc/blimp/layer_tree_host_remote.h"
@@ skipping 281 matching lines @@
   layer->SetBounds(gfx::Size(3, 14));
   layer->SetDoubleSided(!layer->double_sided());
   layer->SetHideLayerAndSubtree(!layer->hide_layer_and_subtree());
   layer->SetMasksToBounds(!layer->masks_to_bounds());
   layer->AddMainThreadScrollingReasons(
       MainThreadScrollingReason::kHasBackgroundAttachmentFixedObjects);
   layer->SetNonFastScrollableRegion(Region(gfx::Rect(5, 1, 14, 3)));
   layer->SetNonFastScrollableRegion(Region(gfx::Rect(3, 14, 1, 5)));
   layer->SetContentsOpaque(!layer->contents_opaque());
   layer->SetOpacity(0.4f);
-  layer->SetBlendMode(SkXfermode::kOverlay_Mode);
+  layer->SetBlendMode(SkBlendMode::kOverlay);
   layer->SetIsRootForIsolatedGroup(!layer->is_root_for_isolated_group());
   layer->SetPosition(gfx::PointF(3.14f, 6.28f));
   layer->SetIsContainerForFixedPositionLayers(
       !layer->IsContainerForFixedPositionLayers());
   LayerPositionConstraint pos_con;
   pos_con.set_is_fixed_to_bottom_edge(true);
   layer->SetPositionConstraint(pos_con);
   layer->SetShouldFlattenTransform(!layer->should_flatten_transform());
   layer->SetUseParentBackfaceVisibility(
       !layer->use_parent_backface_visibility());
@@ skipping 90 matching lines @@
       FakePictureLayer::Create(EmptyContentLayerClient::GetInstance());
   root_layer_src->AddChild(picture_layer_src);
   picture_layer_src->SetNeedsDisplay();
   VerifySerializationAndDeserialization();
   layer_tree_host_in_process_->UpdateLayers();
   VerifySerializedPictureLayersAreIdentical(
       picture_layer_src.get(), compositor_state_deserializer_.get());
 }
 
 }  // namespace cc