Add support for converting cc::FilterOperations into an SkImageFilter

cc/trees/layer_tree_host_common.cc

Index: cc/trees/layer_tree_host_common.cc
diff --git a/cc/trees/layer_tree_host_common.cc b/cc/trees/layer_tree_host_common.cc
index 785542108fa5fa5d6f39d24aadf8628263ea487e..49e5a0acc1e0485adfae9069fa3fc8a05fabecaa 100644
--- a/cc/trees/layer_tree_host_common.cc
+++ b/cc/trees/layer_tree_host_common.cc
@@ -555,8 +555,7 @@ static bool SubtreeShouldRenderToSeparateSurface(
   }
 
   // If the layer uses a CSS filter.
-  if (!layer->filters().IsEmpty() || !layer->background_filters().IsEmpty() ||
-      layer->filter()) {
+  if (!layer->filters().IsEmpty() || !layer->background_filters().IsEmpty()) {
     DCHECK(!is_root);
     return true;
   }
@@ -1547,7 +1546,8 @@ static void CalculateDrawPropertiesInternal(
 
     // TODO(senorblanco): make this smarter for the SkImageFilter case (check
     // for pixel-moving filters)
-    if (layer->filters().HasFilterThatMovesPixels() || layer->filter())
+    if (layer->filters().HasFilterThatMovesPixels() ||
+        layer->filters().HasReferenceFilter())

[danakj, 2013/09/09 22:04:50]

move this to be first so we don't call HasFilterThatMoves... ?

[ajuma, 2013/09/10 21:17:58]

Done.

       nearest_ancestor_surface_that_moves_pixels = render_surface;
 
     render_surface->SetNearestAncestorThatMovesPixels(