Add SurfaceDisplayOutputSurface unittests

cc/test/ordered_simple_task_runner.cc

Index: cc/test/ordered_simple_task_runner.cc
diff --git a/cc/test/ordered_simple_task_runner.cc b/cc/test/ordered_simple_task_runner.cc
index 9fc22aded6d73a1d0bee912fe0fcf275bb3910b4..4bf97837371973ccbb2821c922e4ea4add8cf18d 100644
--- a/cc/test/ordered_simple_task_runner.cc
+++ b/cc/test/ordered_simple_task_runner.cc
@@ -78,6 +78,7 @@ void TestOrderablePendingTask::AsValueInto(
 OrderedSimpleTaskRunner::OrderedSimpleTaskRunner()
     : advance_now_(true),
       now_src_(TestNowSource::Create(0)),
+      max_tasks_(kAbsoluteMaxTasks),
       inside_run_tasks_until_(false) {
 }
 
@@ -286,6 +287,10 @@ void OrderedSimpleTaskRunner::AsValueInto(
   state->BeginDictionary("now_src");
   now_src_->AsValueInto(state);
   state->EndDictionary();
+
+  state->SetBoolean("advance_now", advance_now_);
+  state->SetBoolean("inside_run_tasks_until", inside_run_tasks_until_);
+  state->SetString("max_tasks", base::SizeTToString(max_tasks_));
 }
 
 base::Callback<bool(void)> OrderedSimpleTaskRunner::TaskRunCountBelow(