cc : Delete layer's draw blend mode

cc/layers/layer.h

 // Copyright 2010 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.
 
 #ifndef CC_LAYERS_LAYER_H_
 #define CC_LAYERS_LAYER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 114 matching lines @@
   virtual void SetOpacity(float opacity);
   float opacity() const { return inputs_.opacity; }
   float EffectiveOpacity() const;
   virtual bool OpacityCanAnimateOnImplThread() const;
 
   virtual bool AlwaysUseActiveTreeOpacity() const;
 
   void SetBlendMode(SkBlendMode blend_mode);
   SkBlendMode blend_mode() const { return inputs_.blend_mode; }
 
-  void set_draw_blend_mode(SkBlendMode blend_mode) {
-    if (draw_blend_mode_ == blend_mode)
-      return;
-    draw_blend_mode_ = blend_mode;
-    SetNeedsPushProperties();
-  }
-  SkBlendMode draw_blend_mode() const { return draw_blend_mode_; }
-
   // A layer is root for an isolated group when it and all its descendants are
   // drawn over a black and fully transparent background, creating an isolated
   // group. It should be used along with SetBlendMode(), in order to restrict
   // layers within the group to blend with layers outside this group.
   void SetIsRootForIsolatedGroup(bool root);
   bool is_root_for_isolated_group() const {
     return inputs_.is_root_for_isolated_group;
   }
 
   void SetFilters(const FilterOperations& filters);
@@ skipping 477 matching lines @@
   bool should_flatten_transform_from_property_tree_ : 1;
   bool draws_content_ : 1;
   bool use_local_transform_for_backface_visibility_ : 1;
   bool should_check_backface_visibility_ : 1;
   bool force_render_surface_for_testing_ : 1;
   bool subtree_property_changed_ : 1;
   bool may_contain_video_ : 1;
   bool is_scroll_clip_layer_ : 1;
   bool needs_show_scrollbars_ : 1;
   SkColor safe_opaque_background_color_;
-  // draw_blend_mode may be different than blend_mode_,
-  // when a RenderSurface re-parents the layer's blend_mode.
-  SkBlendMode draw_blend_mode_;
   std::unique_ptr<std::set<Layer*>> scroll_children_;
 
   std::unique_ptr<std::set<Layer*>> clip_children_;
 
   PaintProperties paint_properties_;
 
   // These all act like draw properties, so don't need push properties.
   gfx::Rect visible_layer_rect_;
   size_t num_unclipped_descendants_;
 
   DISALLOW_COPY_AND_ASSIGN(Layer);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_H_