cc : Delete layer's draw blend mode

cc/trees/layer_tree_host_common_unittest.cc

 // Copyright 2011 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/trees/layer_tree_host_common.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <memory>
@@ skipping 1562 matching lines @@
 
   root->SetBounds(gfx::Size(10, 10));
   child->SetBounds(gfx::Size(10, 10));
   child->SetDrawsContent(true);
   child->test_properties()->blend_mode = SkBlendMode::kMultiply;
   child->test_properties()->opacity = 0.5f;
   child->test_properties()->force_render_surface = true;
   ExecuteCalculateDrawProperties(root);
 
   // Since the child layer has a blend mode other than normal, it should get
-  // its own render surface. Also, layer's draw_properties should contain the
-  // default blend mode, since the render surface becomes responsible for
-  // applying the blend mode.
+  // its own render surface.
   ASSERT_TRUE(child->GetRenderSurface());
   EXPECT_EQ(1.0f, child->draw_opacity());
   EXPECT_EQ(0.5f, child->GetRenderSurface()->draw_opacity());
-  EXPECT_EQ(SkBlendMode::kSrcOver, child->draw_blend_mode());
+  EXPECT_EQ(SkBlendMode::kMultiply, child->GetRenderSurface()->BlendMode());
 }
 
 TEST_F(LayerTreeHostCommonTest, RenderSurfaceDrawOpacity) {
   LayerImpl* root = root_layer_for_testing();
   LayerImpl* surface1 = AddChildToRoot<LayerImpl>();
   LayerImpl* not_surface = AddChild<LayerImpl>(surface1);
   LayerImpl* surface2 = AddChild<LayerImpl>(not_surface);
 
   root->SetBounds(gfx::Size(10, 10));
   surface1->SetBounds(gfx::Size(10, 10));
@@ skipping 9269 matching lines @@
 
   // Check child layer draw properties.
   EXPECT_EQ(gfx::Rect(10, 10), child->visible_layer_rect());
   EXPECT_EQ(gfx::Transform(), child->DrawTransform());
   EXPECT_EQ(gfx::Rect(10, 10), child->clip_rect());
   EXPECT_EQ(gfx::Rect(10, 10), child->drawable_content_rect());
 }
 
 }  // namespace
 }  // namespace cc