fix property linkage warnings

ash/wm/window_properties.h

Index: ash/wm/window_properties.h
diff --git a/ash/wm/window_properties.h b/ash/wm/window_properties.h
index a2edb8a23dcd1d44279b280438282994db569590..9f79a44c439289285e1aa83fe519e28a7efe2552 100644
--- a/ash/wm/window_properties.h
+++ b/ash/wm/window_properties.h
@@ -6,8 +6,10 @@
 #define ASH_WM_WINDOW_PROPERTIES_H_
 #pragma once
 
+#include "ash/wm/property_util.h"
 #include "ash/wm/shadow_types.h"
 #include "ui/aura/window.h"
+#include "ui/base/ui_base_types.h"
 
 namespace ash {
 namespace internal {
@@ -16,10 +18,26 @@ namespace internal {
 
 // Alphabetical sort.
 
+// Property set on all windows whose child windows' visibility changes are
+// animated.
+extern const aura::WindowProperty<bool>* const
+    kChildWindowVisibilityChangesAnimatedKey;
+
+// Used to remember the show state before the window was minimized.
+extern const aura::WindowProperty<ui::WindowShowState>* const
+    kRestoreShowStateKey;
+
 // A property key describing the drop shadow that should be displayed under the
 // window.  If unset, no shadow is displayed.
 extern const aura::WindowProperty<ShadowType>* const kShadowTypeKey;
 
+extern const aura::WindowProperty<WindowPersistsAcrossAllWorkspacesType>* const
+    kWindowPersistsAcrossAllWorkspacesKey;
+
+// True if the window is controlled by the workspace manager.
+extern const aura::WindowProperty<bool>* const
+    kWindowTrackedByWorkspaceKey;
+
 // Alphabetical sort.
 
 }  // namespace internal