stop using SkXfermode -- use SkBlendMode instead

cc/layers/render_surface_impl.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/layers/render_surface_impl.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 
@@ skipping 86 matching lines @@
   // functions (for example, gfx::ToEnclosedRect) that are called on this rect.
   if (std::isnan(drawable_content_rect.x()) ||
       std::isnan(drawable_content_rect.y()) ||
       std::isnan(drawable_content_rect.right()) ||
       std::isnan(drawable_content_rect.bottom()))
     return gfx::RectF();
 
   return drawable_content_rect;
 }
 
-SkXfermode::Mode RenderSurfaceImpl::BlendMode() const {
+SkBlendMode RenderSurfaceImpl::BlendMode() const {
   return OwningEffectNode()->blend_mode;
 }
 
 bool RenderSurfaceImpl::UsesDefaultBlendMode() const {
-  return BlendMode() == SkXfermode::kSrcOver_Mode;
+  return BlendMode() == SkBlendMode::kSrcOver;
 }
 
 SkColor RenderSurfaceImpl::GetDebugBorderColor() const {
   return DebugColors::SurfaceBorderColor();
 }
 
 float RenderSurfaceImpl::GetDebugBorderWidth() const {
   return DebugColors::SurfaceBorderWidth(owning_layer_->layer_tree_impl());
 }
 
@@ skipping 281 matching lines @@
 
   RenderPassDrawQuad* quad =
       render_pass->CreateAndAppendDrawQuad<RenderPassDrawQuad>();
   quad->SetNew(shared_quad_state, content_rect(), visible_layer_rect,
                render_pass_id, mask_resource_id, mask_uv_scale,
                mask_texture_size, Filters(), owning_layer_to_target_scale,
                FiltersOrigin(), BackgroundFilters());
 }
 
 }  // namespace cc