Makes WorkspaceLayoutManager use ash/wm/common types

ash/wm/common/wm_shell_window_ids.h

Index: ash/wm/common/wm_shell_window_ids.h
diff --git a/ash/wm/common/wm_shell_window_ids.h b/ash/wm/common/wm_shell_window_ids.h
index a863423f3c5e039c90ce1c91c34eb59d675c5cc6..421f4f06d5a10cb8a867c2343e8906f8effc1ec5 100644
--- a/ash/wm/common/wm_shell_window_ids.h
+++ b/ash/wm/common/wm_shell_window_ids.h
@@ -19,12 +19,19 @@ namespace ash {
 // The container for standard top-level windows.
 const int kShellWindowId_DefaultContainer = 6;
 
+// The container for top-level windows with the 'always-on-top' flag set.
+const int kShellWindowId_AlwaysOnTopContainer = 7;
+
 // The container for windows docked to either side of the desktop.
 const int kShellWindowId_DockedContainer = 8;
 
 // The container for panel windows.
 const int kShellWindowId_PanelContainer = 11;
 
+// TODO(sky): this seems unnecessary. Perhaps it should be injected?
+// The container for the app list.
+const int kShellWindowId_AppListContainer = 12;
+
 }  // namespace ash
 
 #endif  // ASH_WM_COMMON_WM_SHELL_WINDOW_IDS_H_