stop using SkXfermode -- use SkBlendMode instead

cc/output/software_renderer.cc

 // Copyright 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 "cc/output/software_renderer.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/trace_event/trace_event.h"
 #include "cc/base/math_util.h"
 #include "cc/output/copy_output_request.h"
@@ skipping 219 matching lines @@
                                        quad->IsLeftEdge() &&
                                        quad->IsBottomEdge() &&
                                        quad->IsRightEdge();
     if (settings_->allow_antialiasing &&
         (settings_->force_antialiasing || all_four_edges_are_exterior))
       current_paint_.setAntiAlias(true);
     current_paint_.setFilterQuality(kLow_SkFilterQuality);
   }
 
   if (quad->ShouldDrawWithBlending() ||
-      quad->shared_quad_state->blend_mode != SkXfermode::kSrcOver_Mode) {
+      quad->shared_quad_state->blend_mode != SkBlendMode::kSrcOver) {
     current_paint_.setAlpha(quad->shared_quad_state->opacity * 255);
-    current_paint_.setBlendMode(
-        static_cast<SkBlendMode>(quad->shared_quad_state->blend_mode));
+    current_paint_.setBlendMode(quad->shared_quad_state->blend_mode);
   } else {
     current_paint_.setBlendMode(SkBlendMode::kSrc);
   }
 
   if (draw_region) {
     gfx::QuadF local_draw_region(*draw_region);
     SkPath draw_region_clip_path;
     local_draw_region -=
         gfx::Vector2dF(quad->visible_rect.x(), quad->visible_rect.y());
     local_draw_region.Scale(1.0f / quad->visible_rect.width(),
@@ skipping 460 matching lines @@
       ApplyImageFilter(filter.get(), quad, backdrop_bitmap, nullptr);
 
   if (!filter_backdrop_image)
     return nullptr;
 
   return filter_backdrop_image->makeShader(content_tile_mode, content_tile_mode,
                                            &filter_backdrop_transform);
 }
 
 }  // namespace cc