cc: Move blend_mode to the effect tree

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 87 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 {
+  return OwningEffectNode()->blend_mode;
+}
+
+bool RenderSurfaceImpl::UsesDefaultBlendMode() const {
+  return BlendMode() == SkXfermode::kSrcOver_Mode;
+}
+
 SkColor RenderSurfaceImpl::GetDebugBorderColor() const {
   return DebugColors::SurfaceBorderColor();
 }
 
 SkColor RenderSurfaceImpl::GetReplicaDebugBorderColor() const {
   return DebugColors::SurfaceReplicaBorderColor();
 }
 
 float RenderSurfaceImpl::GetDebugBorderWidth() const {
   return DebugColors::SurfaceBorderWidth(owning_layer_->layer_tree_impl());
@@ skipping 237 matching lines @@
                                     LayerImpl* mask_layer,
                                     AppendQuadsData* append_quads_data,
                                     RenderPassId render_pass_id) {
   gfx::Rect visible_layer_rect =
       occlusion_in_content_space.GetUnoccludedContentRect(content_rect());
   if (visible_layer_rect.IsEmpty())
     return;
 
   SharedQuadState* shared_quad_state =
       render_pass->CreateAndAppendSharedQuadState();
-  shared_quad_state->SetAll(
-      draw_transform, content_rect().size(), content_rect(),
-      draw_properties_.clip_rect, draw_properties_.is_clipped,
-      draw_properties_.draw_opacity, owning_layer_->blend_mode(),
-      owning_layer_->sorting_context_id());
+  shared_quad_state->SetAll(draw_transform, content_rect().size(),
+                            content_rect(), draw_properties_.clip_rect,
+                            draw_properties_.is_clipped,
+                            draw_properties_.draw_opacity, BlendMode(),
+                            owning_layer_->sorting_context_id());
 
   if (owning_layer_->ShowDebugBorders()) {
     DebugBorderDrawQuad* debug_border_quad =
         render_pass->CreateAndAppendDrawQuad<DebugBorderDrawQuad>();
     debug_border_quad->SetNew(shared_quad_state, content_rect(),
                               visible_layer_rect, debug_border_color,
                               debug_border_width);
   }
 
   ResourceId mask_resource_id = 0;
@@ skipping 19 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,
                BackgroundFilters());
 }
 
 }  // namespace cc