Allow setting different hit test bounds overrides for mouse and touch

ash/wm/frame_border_hittest_controller.h

Index: ash/wm/frame_border_hittest_controller.h
diff --git a/ash/wm/frame_border_hittest_controller.h b/ash/wm/frame_border_hittest_controller.h
index f4fa16ab12e0a6d7f895fa76574f4f2a279700f0..a79431f9755dfeb6456da0eb6342a1067763dd65 100644
--- a/ash/wm/frame_border_hittest_controller.h
+++ b/ash/wm/frame_border_hittest_controller.h
@@ -46,7 +46,10 @@ class ASH_EXPORT FrameBorderHittestController : public wm::WindowStateObserver,
   // WindowStateObserver override:
   virtual void OnWindowShowTypeChanged(wm::WindowState* window_state,
                                        wm::WindowShowType old_type) OVERRIDE;
-  // WindowObserver override:
+  // WindowObserver overrides:
+  virtual void OnWindowPropertyChanged(aura::Window* window,
+                                       const void* key,
+                                       intptr_t old) OVERRIDE;
   virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
 
   // The window whose hittest override bounds are being managed.