Use a cc::Display for layout tests.

cc/test/layer_tree_pixel_test.cc

Index: cc/test/layer_tree_pixel_test.cc
diff --git a/cc/test/layer_tree_pixel_test.cc b/cc/test/layer_tree_pixel_test.cc
index 09340e7543680187ebd87dc3818be14abf58c02e..d0ec4054e80807ba74e64f1f7f696a56d8d10b4c 100644
--- a/cc/test/layer_tree_pixel_test.cc
+++ b/cc/test/layer_tree_pixel_test.cc
@@ -46,18 +46,20 @@ void LayerTreePixelTest::InitializeSettings(LayerTreeSettings* settings) {
 std::unique_ptr<OutputSurface> LayerTreePixelTest::CreateOutputSurface() {
   scoped_refptr<TestInProcessContextProvider> compositor;
   scoped_refptr<TestInProcessContextProvider> worker;
+  scoped_refptr<TestInProcessContextProvider> display;
   if (test_type_ == PIXEL_TEST_GL) {
     compositor = new TestInProcessContextProvider(nullptr);
     worker = new TestInProcessContextProvider(compositor.get());
+    display = new TestInProcessContextProvider(nullptr);
   }
   const bool allow_force_reclaim_resources = !HasImplThread();
   const bool synchronous_composite =
       !layer_tree_host()->settings().single_thread_proxy_scheduler;
   std::unique_ptr<PixelTestDelegatingOutputSurface> delegating_output_surface(
       new PixelTestDelegatingOutputSurface(
-          std::move(compositor), std::move(worker), shared_bitmap_manager(),
-          gpu_memory_buffer_manager(), allow_force_reclaim_resources,
-          synchronous_composite));
+          std::move(compositor), std::move(worker), std::move(display),
+          shared_bitmap_manager(), gpu_memory_buffer_manager(),
+          allow_force_reclaim_resources, synchronous_composite));
   delegating_output_surface->SetEnlargePassTextureAmount(
       enlarge_texture_amount_);
   return std::move(delegating_output_surface);