cc: Make LayerTreeTests use a DelegatingRenderer and Display.

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index b32ed4e00bcbb3aa36ed3c7f8611da47db624879..243e81da0aea8d6a4a7640d5246cc649659ab0b1 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -797,11 +797,12 @@ DrawResult LayerTreeHostImpl::CalculateRenderPasses(
       !root_surface->layer_list().empty();
   bool hud_wants_to_draw_ = active_tree_->hud_layer() &&
                             active_tree_->hud_layer()->IsAnimatingHUDContents();
+  bool resources_must_be_resent =
+      output_surface_->capabilities().can_force_reclaim_resources;
   if (root_surface_has_contributing_layers &&
       root_surface_has_no_visible_damage &&
       !active_tree_->property_trees()->effect_tree.HasCopyRequests() &&
-      !output_surface_->capabilities().can_force_reclaim_resources &&
-      !hud_wants_to_draw_) {
+      !resources_must_be_resent && !hud_wants_to_draw_) {
     TRACE_EVENT0("cc",
                  "LayerTreeHostImpl::CalculateRenderPasses::EmptyDamageRect");
     frame->has_no_damage = true;