[ash-md] Added a delay between system menu default/detailed view transitions.

base/test/test_mock_time_task_runner.h

Index: base/test/test_mock_time_task_runner.h
diff --git a/base/test/test_mock_time_task_runner.h b/base/test/test_mock_time_task_runner.h
index 624f739cfa55604089e39858919ccaf117bb5701..0caa93506a36b0aea9e76073036660529518ec79 100644
--- a/base/test/test_mock_time_task_runner.h
+++ b/base/test/test_mock_time_task_runner.h
@@ -7,6 +7,7 @@
 
 #include <stddef.h>
 
+#include <deque>
 #include <memory>
 #include <queue>
 #include <vector>
@@ -83,6 +84,7 @@ class TestMockTimeTaskRunner : public SingleThreadTaskRunner {
   // source. The returned TickClock will hold a reference to |this|.
   std::unique_ptr<TickClock> GetMockTickClock() const;
 
+  std::deque<TestPendingTask> TakePendingTasks();
   bool HasPendingTask() const;
   size_t GetPendingTaskCount() const;
   TimeDelta NextPendingTaskDelay() const;