Force use of and cache render surface.

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 47f3fc27ee865a923fb1f699bd99b09b325f3310..d8c6e104b9f9d4c243de55142a0e9fdd73ee18d9 100644
--- a/cc/trees/layer_tree_host_common.cc
+++ b/cc/trees/layer_tree_host_common.cc
@@ -307,6 +307,7 @@ static void AddSurfaceToRenderSurfaceList(
   // pixel-moving filters)
   const FilterOperations& filters = render_surface->Filters();
   bool is_occlusion_immune = render_surface->HasCopyRequest() ||
+                             render_surface->ForceRenderSurface() ||
                              filters.HasReferenceFilter() ||
                              filters.HasFilterThatMovesPixels();
   if (is_occlusion_immune) {
@@ -379,7 +380,7 @@ static void ComputeInitialRenderSurfaceList(
     bool has_animating_opacity_and_hidden =
         effect_node->has_potential_opacity_animation &&
         property_trees->effect_tree.EffectiveOpacity(effect_node) == 0.f &&
-        !effect_node->has_copy_request;
+        !effect_node->has_copy_request && !effect_node->force_render_surface;
 
     bool skip_layer = !is_root && (skip_draw_properties_computation ||
                                    skip_for_invertibility ||