cc: Allow transparent layers with background filters to render

cc/trees/layer_tree_host_common.cc

 // 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.
 
 #include "cc/trees/layer_tree_host_common.h"
 
 #include <algorithm>
 
 #include "base/trace_event/trace_event.h"
 #include "cc/base/math_util.h"
@@ skipping 451 matching lines @@
   if (!layer_is_drawn)
     return true;
 
   // If layer is on the pending tree and opacity is being animated then
   // this subtree can't be skipped as we need to create, prioritize and
   // include tiles for this layer when deciding if tree can be activated.
   if (layer->layer_tree_impl()->IsPendingTree() &&
       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.
   return !layer->opacity();
 }
 
 static inline void SavePaintPropertiesLayer(LayerImpl* layer) {}
 
 static bool SubtreeShouldRenderToSeparateSurface(
     Layer* layer,
@@ skipping 2099 matching lines @@
 
 PropertyTrees* GetPropertyTrees(Layer* layer) {
   return layer->layer_tree_host()->property_trees();
 }
 
 PropertyTrees* GetPropertyTrees(LayerImpl* layer) {
   return layer->layer_tree_impl()->property_trees();
 }
 
 }  // namespace cc