cc::SurfaceDependencyTracker should not crash when a Display goes away

cc/layers/surface_layer_impl.cc

Index: cc/layers/surface_layer_impl.cc
diff --git a/cc/layers/surface_layer_impl.cc b/cc/layers/surface_layer_impl.cc
index 714e88bd0037c80bb14df677fbb97d60bec100c1..e42bca07ed53d0445ff749fab0cc890b0be9ec1a 100644
--- a/cc/layers/surface_layer_impl.cc
+++ b/cc/layers/surface_layer_impl.cc
@@ -72,7 +72,8 @@ void SurfaceLayerImpl::AppendQuads(RenderPass* render_pass,
   // Emitting a fallback SurfaceDrawQuad is unnecessary if the primary and
   // fallback surface Ids match.
   bool needs_fallback =
-      fallback_surface_info_.id() != primary_surface_info_.id();
+      fallback_surface_info_.is_valid() &&
+      (fallback_surface_info_.id() != primary_surface_info_.id());
   if (primary && needs_fallback) {
     // Add the primary surface ID as a dependency.
     append_quads_data->activation_dependencies.push_back(