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

cc/layers/surface_layer_impl.cc

 // Copyright 2014 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/layers/surface_layer_impl.h"
 
 #include <stdint.h>
 
 #include "base/trace_event/trace_event_argument.h"
 #include "cc/debug/debug_colors.h"
@@ skipping 54 matching lines @@
 void SurfaceLayerImpl::AppendQuads(RenderPass* render_pass,
                                    AppendQuadsData* append_quads_data) {
   AppendRainbowDebugBorder(render_pass);
   SharedQuadState* common_shared_quad_state = nullptr;
   auto* primary =
       CreateSurfaceDrawQuad(render_pass, SurfaceDrawQuadType::PRIMARY,
                             primary_surface_info_, &common_shared_quad_state);
   // 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(
         primary_surface_info_.id());
     // We can use the same SharedQuadState as the primary SurfaceDrawQuad if
     // we don't need a different transform on the fallback.
     bool use_common_shared_quad_state =
         !stretch_content_to_fill_bounds_ &&
         primary_surface_info_.device_scale_factor() ==
             fallback_surface_info_.device_scale_factor();
@@ skipping 159 matching lines @@
   dict->SetString("surface_id", primary_surface_info_.id().ToString());
   dict->SetString("fallback_surface_id",
                   fallback_surface_info_.id().ToString());
 }
 
 const char* SurfaceLayerImpl::LayerTypeAsString() const {
   return "cc::SurfaceLayerImpl";
 }
 
 }  // namespace cc