cc: Move blend_mode to the effect tree

cc/layers/layer_impl.cc

Index: cc/layers/layer_impl.cc
diff --git a/cc/layers/layer_impl.cc b/cc/layers/layer_impl.cc
index 44260b61df4e467d9ac9edc6a4decd926d07909b..72eed8c06e7555bef7a8a91df55fbc23800dbce1 100644
--- a/cc/layers/layer_impl.cc
+++ b/cc/layers/layer_impl.cc
@@ -69,7 +69,6 @@ LayerImpl::LayerImpl(LayerTreeImpl* tree_impl, int id)
       was_ever_ready_since_last_transform_animation_(true),
       background_color_(0),
       safe_opaque_background_color_(0),
-      blend_mode_(SkXfermode::kSrcOver_Mode),
       draw_blend_mode_(SkXfermode::kSrcOver_Mode),
       transform_tree_index_(-1),
       effect_tree_index_(-1),
@@ -350,7 +349,6 @@ void LayerImpl::PushPropertiesTo(LayerImpl* layer) {
   layer->touch_event_handler_region_ = touch_event_handler_region_;
   layer->background_color_ = background_color_;
   layer->safe_opaque_background_color_ = safe_opaque_background_color_;
-  layer->blend_mode_ = blend_mode_;
   layer->draw_blend_mode_ = draw_blend_mode_;
   layer->position_ = position_;
   layer->transform_ = transform_;
@@ -862,10 +860,6 @@ void LayerImpl::SetMutableProperties(uint32_t properties) {
   layer_tree_impl_->AddToElementMap(this);
 }
 
-void LayerImpl::SetBlendMode(SkXfermode::Mode blend_mode) {
-  blend_mode_ = blend_mode;
-}
-
 void LayerImpl::SetPosition(const gfx::PointF& position) {
   position_ = position;
 }