feat: add support for associating a Menu with a WebFrameMain (#45138)

* feat: add support for associating a Menu with a WebFrameMain

This allows certain OS level features to activate such as Writing Tools, Autofill.. and Services.

There appears to be a bug in macOS where the responder chain isn't traversed if the menu is not popped up using an event, as such we spoof a fake mouse event at the write coordinates in the right window and use that to open the menu.

* build: fix build on non-mac

* build: oops missed a header

* fix: safely handle optional T* by checking nullptr too

* build: fix gn check and build errors

* docs: suggested changes

* feat: default `frame` to `window.webContents.mainFrame` when possible

* fix: avoid deref nullptr view

* Revert "feat: default `frame` to `window.webContents.mainFrame` when possible"

This reverts commit 2e88836819.

* fix: lint

* Remove redundant scoped objects

This code, including the comments, matches almost exactly the behavior of this argument to the function.

* Add ScopedPumpMessagesInPrivateModes patch

* More null pointer safety

---------

Co-authored-by: clavin <clavin@electronjs.org>

shell/browser/api/electron_api_menu_views.h

@@ -22,6 +22,7 @@ class MenuViews : public Menu {
  protected:
   // Menu
   void PopupAt(BaseWindow* window,
+               std::optional<WebFrameMain*> frame,
                int x,
                int y,
                int positioning_item,