Force use of and cache render surface.

cc/trees/effect_node.cc

Index: cc/trees/effect_node.cc
diff --git a/cc/trees/effect_node.cc b/cc/trees/effect_node.cc
index 7a556277530b4f8108e088d2423ceec6f210ace4..757f1d3c5245879f8759f509c9075b99dd58fc3b 100644
--- a/cc/trees/effect_node.cc
+++ b/cc/trees/effect_node.cc
@@ -17,6 +17,7 @@ EffectNode::EffectNode()
       screen_space_opacity(1.f),
       blend_mode(SkBlendMode::kSrcOver),
       has_render_surface(false),
+      force_render_surface(false),
       has_copy_request(false),
       hidden_by_backface_visibility(false),
       double_sided(false),
@@ -41,6 +42,7 @@ bool EffectNode::operator==(const EffectNode& other) const {
          owning_layer_id == other.owning_layer_id && opacity == other.opacity &&
          screen_space_opacity == other.screen_space_opacity &&
          has_render_surface == other.has_render_surface &&
+         force_render_surface == other.force_render_surface &&
          has_copy_request == other.has_copy_request &&
          filters == other.filters &&
          background_filters == other.background_filters &&
@@ -72,6 +74,7 @@ void EffectNode::AsValueInto(base::trace_event::TracedValue* value) const {
   value->SetInteger("owning_layer_id", owning_layer_id);
   value->SetDouble("opacity", opacity);
   value->SetBoolean("has_render_surface", has_render_surface);
+  value->SetBoolean("force_render_surface", force_render_surface);
   value->SetBoolean("has_copy_request", has_copy_request);
   value->SetBoolean("double_sided", double_sided);
   value->SetBoolean("is_drawn", is_drawn);