Tray elements behave appropriately on the multiple signin screen (more like lock screen)

ash/test/shell_test_api.h

Index: ash/test/shell_test_api.h
diff --git a/ash/test/shell_test_api.h b/ash/test/shell_test_api.h
index 73643974fd851ef9d762b012666f03148635da7c..16cc576c4d36f2621cdda29de718861d38be803f 100644
--- a/ash/test/shell_test_api.h
+++ b/ash/test/shell_test_api.h
@@ -17,6 +17,7 @@ class AshNativeCursorManager;
 class DragDropController;
 class MaximizeModeWindowManager;
 class RootWindowLayoutManager;
+class SessionStateDelegate;
 class ScreenPositionController;
 class ShelfDelegate;
 class ShelfModel;
@@ -46,6 +47,9 @@ public:
   // Set ShelfDelegate.
   void SetShelfDelegate(ShelfDelegate* delegate);
 
+  // Set SessionStateDelegate.
+  void SetSessionStateDelegate(SessionStateDelegate* session_state_delegate);
+
  private:
   Shell* shell_;  // not owned