Disables showing tooltips while a system menu is showing on windows

ui/views/win/hwnd_message_handler.h

Index: ui/views/win/hwnd_message_handler.h
diff --git a/ui/views/win/hwnd_message_handler.h b/ui/views/win/hwnd_message_handler.h
index e02ef56b517a25812c216c3dc22222f9af665fc5..802b70290c7318531606c3e3f3087244a15a79ab 100644
--- a/ui/views/win/hwnd_message_handler.h
+++ b/ui/views/win/hwnd_message_handler.h
@@ -342,6 +342,8 @@ class VIEWS_EXPORT HWNDMessageHandler :
     MSG_WM_CREATE(OnCreate)
     MSG_WM_DESTROY(OnDestroy)
     MSG_WM_DISPLAYCHANGE(OnDisplayChange)
+    MSG_WM_ENTERMENULOOP(OnEnterMenuLoop)
+    MSG_WM_EXITMENULOOP(OnExitMenuLoop)
     MSG_WM_ENTERSIZEMOVE(OnEnterSizeMove)
     MSG_WM_ERASEBKGND(OnEraseBkgnd)
     MSG_WM_EXITSIZEMOVE(OnExitSizeMove)
@@ -383,8 +385,10 @@ class VIEWS_EXPORT HWNDMessageHandler :
   void OnDestroy();
   void OnDisplayChange(UINT bits_per_pixel, const CSize& screen_size);
   LRESULT OnDwmCompositionChanged(UINT msg, WPARAM w_param, LPARAM l_param);
+  void OnEnterMenuLoop(BOOL from_track_popup_menu);
   void OnEnterSizeMove();
   LRESULT OnEraseBkgnd(HDC dc);
+  void OnExitMenuLoop(BOOL is_shortcut_menu);
   void OnExitSizeMove();
   void OnGetMinMaxInfo(MINMAXINFO* minmax_info);
   LRESULT OnGetObject(UINT message, WPARAM w_param, LPARAM l_param);
@@ -521,6 +525,9 @@ class VIEWS_EXPORT HWNDMessageHandler :
   // Copy of custom window region specified via SetRegion(), if any.
   base::win::ScopedRegion custom_window_region_;
 
+  // If > 0 indicates a menu is running (we're showing a native menu).
+  int menu_depth_;
+
   // A factory used to lookup appbar autohide edges.
   base::WeakPtrFactory<HWNDMessageHandler> autohide_factory_;