cc: Move blend_mode to the effect tree

cc/layers/layer_impl_test_properties.cc

 // Copyright 2016 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 "cc/layers/layer_impl_test_properties.h"
 
 #include "cc/layers/layer_impl.h"
 #include "cc/output/copy_output_request.h"
 #include "cc/trees/layer_tree_impl.h"
 
 namespace cc {
 
 LayerImplTestProperties::LayerImplTestProperties(LayerImpl* owning_layer)
     : owning_layer(owning_layer),
       double_sided(true),
       force_render_surface(false),
       is_container_for_fixed_position_layers(false),
       should_flatten_transform(true),
       hide_layer_and_subtree(false),
       opacity_can_animate(false),
       num_descendants_that_draw_content(0),
       num_unclipped_descendants(0),
       opacity(1.f),
+      blend_mode(SkXfermode::kSrcOver_Mode),
       scroll_parent(nullptr),
       clip_parent(nullptr),
       mask_layer(nullptr),
       replica_layer(nullptr),
       parent(nullptr) {}
 
 LayerImplTestProperties::~LayerImplTestProperties() {}
 
 void LayerImplTestProperties::AddChild(std::unique_ptr<LayerImpl> child) {
   child->test_properties()->parent = owning_layer;
@@ skipping 29 matching lines @@
     owning_layer->layer_tree_impl()->RemoveLayer(replica_layer->id());
   }
   replica_layer = replica.get();
   if (replica) {
     replica->test_properties()->parent = owning_layer;
     owning_layer->layer_tree_impl()->AddLayer(std::move(replica));
   }
 }
 
 }  // namespace cc