Add support for converting cc::FilterOperations into an SkImageFilter

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 b0c5399d32e3a3fd06c1963eb585e671e52a6ca4..ad9b9395176284071c42ec49882eb1a199d48f6a 100644
--- a/cc/layers/layer_impl.cc
+++ b/cc/layers/layer_impl.cc
@@ -500,7 +500,6 @@ void LayerImpl::PushPropertiesTo(LayerImpl* layer) {
   layer->SetDrawsContent(DrawsContent());
   layer->SetHideLayerAndSubtree(hide_layer_and_subtree_);
   layer->SetFilters(filters());
-  layer->SetFilter(filter());
   layer->SetBackgroundFilters(background_filters());
   layer->SetMasksToBounds(masks_to_bounds_);
   layer->SetShouldScrollOnMainThread(should_scroll_on_main_thread_);
@@ -818,7 +817,6 @@ void LayerImpl::SetFilters(const FilterOperations& filters) {
   if (filters_ == filters)
     return;
 
-  DCHECK(!filter_);
   filters_ = filters;
   NoteLayerPropertyChangedForSubtree();
 }
@@ -832,15 +830,6 @@ void LayerImpl::SetBackgroundFilters(
   NoteLayerPropertyChanged();
 }
 
-void LayerImpl::SetFilter(const skia::RefPtr<SkImageFilter>& filter) {
-  if (filter_.get() == filter.get())
-    return;
-
-  DCHECK(filters_.IsEmpty());
-  filter_ = filter;
-  NoteLayerPropertyChangedForSubtree();
-}
-
 void LayerImpl::SetMasksToBounds(bool masks_to_bounds) {
   if (masks_to_bounds_ == masks_to_bounds)
     return;