Force use of and cache render surface.

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 <stddef.h>
 
 #include <algorithm>
 
@@ skipping 283 matching lines @@
 
   // Ignore occlusion from outside the surface when surface contents need to be
   // fully drawn. Layers with copy-request need to be complete.  We could be
   // smarter about layers with filters that move pixels and exclude regions
   // where both layers and the filters are occluded, but this seems like
   // overkill.
   // TODO(senorblanco): make this smarter for the SkImageFilter case (check for
   // pixel-moving filters)
   const FilterOperations& filters = render_surface->Filters();
   bool is_occlusion_immune = render_surface->HasCopyRequest() ||
+                             render_surface->ShouldCacheRenderSurface() ||
                              filters.HasReferenceFilter() ||
                              filters.HasFilterThatMovesPixels();
   if (is_occlusion_immune) {
     render_surface->SetNearestOcclusionImmuneAncestor(render_surface);
   } else if (is_root) {
     render_surface->SetNearestOcclusionImmuneAncestor(nullptr);
   } else {
     render_surface->SetNearestOcclusionImmuneAncestor(
         render_surface->render_target()->nearest_occlusion_immune_ancestor());
   }
@@ skipping 356 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