Refactors WindowResizers to use ash/wm/common

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 421f4f06d5a10cb8a867c2343e8906f8effc1ec5..5b1f036117a77f21ba53c4f638e693eb09ee0d64 100644
--- a/ash/wm/common/wm_shell_window_ids.h
+++ b/ash/wm/common/wm_shell_window_ids.h
@@ -25,6 +25,9 @@ const int kShellWindowId_AlwaysOnTopContainer = 7;
 // The container for windows docked to either side of the desktop.
 const int kShellWindowId_DockedContainer = 8;
 
+// The container for the shelf.
+const int kShellWindowId_ShelfContainer = 9;
+
 // The container for panel windows.
 const int kShellWindowId_PanelContainer = 11;
 
@@ -32,6 +35,9 @@ const int kShellWindowId_PanelContainer = 11;
 // The container for the app list.
 const int kShellWindowId_AppListContainer = 12;
 
+// ID of the window created by PhantomWindowController or DragWindowController.
+const int kShellWindowId_PhantomWindow = 23;
+
 }  // namespace ash
 
 #endif  // ASH_WM_COMMON_WM_SHELL_WINDOW_IDS_H_