DesktopAura: Track windows "owned" via the DesktopWindowTreeHost

ui/views/widget/widget.h

Index: ui/views/widget/widget.h
diff --git a/ui/views/widget/widget.h b/ui/views/widget/widget.h
index 2c5ba165dd74f95145584a07675811d383f3064d..445ae1c554370bf6ae9167088f1c86e6c9f6c54a 100644
--- a/ui/views/widget/widget.h
+++ b/ui/views/widget/widget.h
@@ -352,10 +352,13 @@ class VIEWS_EXPORT Widget : public internal::NativeWidgetDelegate,
   static void GetAllChildWidgets(gfx::NativeView native_view,
                                  Widgets* children);
 
-  // Returns all Widgets owned by |native_view| (including child widgets, but
-  // not including itself).
+  // Returns all Widgets owned by |native_view| (including child Widgets, but
+  // not including itself). A Widget is considered "owned" if it is destroyed
+  // automatically when the owner is destroyed. If |include_toplevel| is set,
+  // toplevel Widgets (i.e. those with an OS-level handle) are included.
   static void GetAllOwnedWidgets(gfx::NativeView native_view,
-                                 Widgets* owned);
+                                 Widgets* owned,
+                                 bool include_toplevel);
 
   // Re-parent a NativeView and notify all Widgets in |native_view|'s hierarchy
   // of the change.