cc: Allow transparent layers with background filters to render

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 3c62f12addb4b9cae4c10b1d064f1b206c4a4755..9b22b941269dc4e55dc163204372a1e29253c3df 100644
--- a/cc/trees/layer_tree_host_common.cc
+++ b/cc/trees/layer_tree_host_common.cc
@@ -469,6 +469,11 @@ static inline bool SubtreeShouldBeSkipped(LayerImpl* layer,
       layer->HasPotentiallyRunningOpacityAnimation())
     return false;
 
+  // If layer has a background filter, don't skip the layer, even it the
+  // opacity is 0.
+  if (!layer->background_filters().IsEmpty())
+    return false;
+
   // The opacity of a layer always applies to its children (either implicitly
   // via a render surface or explicitly if the parent preserves 3D), so the
   // entire subtree can be skipped if this layer is fully transparent.