Separate the logic of popup alignment and workarea handling as delegate.

ash/shelf/shelf_layout_manager.h

Index: ash/shelf/shelf_layout_manager.h
diff --git a/ash/shelf/shelf_layout_manager.h b/ash/shelf/shelf_layout_manager.h
index b411f514f7d852c124b48a9f6ad9d1de364fa274..1f317e82af36b5d78eacfb5f7d3555fce624637d 100644
--- a/ash/shelf/shelf_layout_manager.h
+++ b/ash/shelf/shelf_layout_manager.h
@@ -47,6 +47,7 @@ class ShelfLayoutManagerTest;
 class ShelfWidget;
 class StatusAreaWidget;
 class WorkspaceController;
+FORWARD_DECLARE_TEST(PopupAlignmentDelegateTest, AutoHide);
 FORWARD_DECLARE_TEST(WebNotificationTrayTest, PopupAndFullscreen);
 
 // ShelfLayoutManager is the layout manager responsible for the shelf and
@@ -226,6 +227,7 @@ class ASH_EXPORT ShelfLayoutManager :
   friend class ash::ScreenAsh;
   friend class PanelLayoutManagerTest;
   friend class ShelfLayoutManagerTest;
+  FRIEND_TEST_ALL_PREFIXES(ash::PopupAlignmentDelegateTest, AutoHide);
   FRIEND_TEST_ALL_PREFIXES(ash::WebNotificationTrayTest, PopupAndFullscreen);
 
   struct TargetBounds {