Wires up WmShellMus::Add/RemovePointerWatcher

ash/common/wm_shell.h

Index: ash/common/wm_shell.h
diff --git a/ash/common/wm_shell.h b/ash/common/wm_shell.h
index 8dd3d7eb4d6e70841e7dfbfa540547e8ef80e2a1..9950a24fd03347ead5786b830c096f8e498e74b3 100644
--- a/ash/common/wm_shell.h
+++ b/ash/common/wm_shell.h
@@ -305,7 +305,11 @@ class ASH_EXPORT WmShell {
   void AddShellObserver(ShellObserver* observer);
   void RemoveShellObserver(ShellObserver* observer);
 
-  virtual void AddPointerWatcher(views::PointerWatcher* watcher) = 0;
+  // If |wants_moves| is true PointerWatcher::OnPointerEventObserved() is
+  // called for pointer move events. Enabling pointer moves may incur a
+  // performance hit and should be avoided if possible.
+  virtual void AddPointerWatcher(views::PointerWatcher* watcher,
+                                 bool wants_moves) = 0;
   virtual void RemovePointerWatcher(views::PointerWatcher* watcher) = 0;
 
   // TODO: Move these back to LockStateController when that has been moved.