cc: Add image decode queue functionality to image manager.

cc/trees/layer_tree_host_unittest_scroll.cc

Index: cc/trees/layer_tree_host_unittest_scroll.cc
diff --git a/cc/trees/layer_tree_host_unittest_scroll.cc b/cc/trees/layer_tree_host_unittest_scroll.cc
index a34b38d6ea6d214b68eeeb247066b79311e73e7e..13b48a7d9257378355055f5b6d43751646295305 100644
--- a/cc/trees/layer_tree_host_unittest_scroll.cc
+++ b/cc/trees/layer_tree_host_unittest_scroll.cc
@@ -1325,6 +1325,7 @@ TEST(LayerTreeHostFlingTest, DidStopFlingingThread) {
   params.settings = &settings;
   params.main_task_runner = base::ThreadTaskRunnerHandle::Get();
   params.mutator_host = animation_host.get();
+  params.image_worker_task_runner = nullptr;
   std::unique_ptr<LayerTreeHostInProcess> layer_tree_host =
       LayerTreeHostInProcess::CreateThreaded(impl_thread.task_runner(),
                                              &params);