cc: Move blend_mode to the effect tree

cc/layers/layer_impl.h

 // 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.
 
 #ifndef CC_LAYERS_LAYER_IMPL_H_
 #define CC_LAYERS_LAYER_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 194 matching lines @@
   bool contents_opaque() const { return contents_opaque_; }
 
   float Opacity() const;
 
   void SetElementId(ElementId element_id);
   ElementId element_id() const { return element_id_; }
 
   void SetMutableProperties(uint32_t properties);
   uint32_t mutable_properties() const { return mutable_properties_; }
 
-  void SetBlendMode(SkXfermode::Mode);
-  SkXfermode::Mode blend_mode() const { return blend_mode_; }
   void set_draw_blend_mode(SkXfermode::Mode blend_mode) {
     draw_blend_mode_ = blend_mode;
   }
   SkXfermode::Mode draw_blend_mode() const { return draw_blend_mode_; }
-  bool uses_default_blend_mode() const {
-    return blend_mode_ == SkXfermode::kSrcOver_Mode;
-  }
 
   void SetPosition(const gfx::PointF& position);
   gfx::PointF position() const { return position_; }
 
   bool IsAffectedByPageScale() const;
 
   gfx::Vector2dF FixedContainerSizeDelta() const;
 
   bool Is3dSorted() const { return sorting_context_id_ != 0; }
 
@@ skipping 300 matching lines @@
 
   // This is true if and only if the layer was ever ready since it last animated
   // (all content was complete).
   bool was_ever_ready_since_last_transform_animation_ : 1;
 
   Region non_fast_scrollable_region_;
   Region touch_event_handler_region_;
   SkColor background_color_;
   SkColor safe_opaque_background_color_;
 
-  SkXfermode::Mode blend_mode_;
-  // draw_blend_mode may be different than blend_mode_,
-  // when a RenderSurface re-parents the layer's blend_mode.
   SkXfermode::Mode draw_blend_mode_;
   gfx::PointF position_;
   gfx::Transform transform_;
 
   gfx::Rect clip_rect_in_target_space_;
   int transform_tree_index_;
   int effect_tree_index_;
   int clip_tree_index_;
   int scroll_tree_index_;
 
@@ skipping 32 matching lines @@
   bool scrolls_drawn_descendant_ : 1;
   bool has_will_change_transform_hint_ : 1;
   bool needs_push_properties_ : 1;
 
   DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_IMPL_H_