mash: Convert ShelfWindowWatcher to wm common types

ash/common/wm_window.h

Index: ash/common/wm_window.h
diff --git a/ash/common/wm_window.h b/ash/common/wm_window.h
index c40e6d13e86db1ebe56e277aedfc1bb840918516..61eb24445219a161cf92210eb741d8dee55027b3 100644
--- a/ash/common/wm_window.h
+++ b/ash/common/wm_window.h
@@ -39,6 +39,7 @@ class Widget;
 
 namespace ash {
 
+struct ShelfItemDetails;
 class WmLayoutManager;
 class WmRootWindowController;
 class WmShell;
@@ -119,6 +120,10 @@ class ASH_EXPORT WmWindow {
 
   virtual bool GetBoolProperty(WmWindowProperty key) = 0;
   virtual int GetIntProperty(WmWindowProperty key) = 0;
+  virtual void SetIntProperty(WmWindowProperty key, int value) = 0;
+
+  // Returns null if there are no details.
+  virtual ShelfItemDetails* GetShelfItemDetails() = 0;
 
   wm::WindowState* GetWindowState() {
     return const_cast<wm::WindowState*>(