Open the WrenchMenu on mouseover when dragging a browser action

ui/views/controls/menu/menu_runner.h

Index: ui/views/controls/menu/menu_runner.h
diff --git a/ui/views/controls/menu/menu_runner.h b/ui/views/controls/menu/menu_runner.h
index 3eb2cc1317aaec9c593e0e8e1144e8c4455bc8da..1744c93cb70b4eaecd121ff69f2cdc120e8e867a 100644
--- a/ui/views/controls/menu/menu_runner.h
+++ b/ui/views/controls/menu/menu_runner.h
@@ -82,6 +82,12 @@ class VIEWS_EXPORT MenuRunner {
     // The menu should behave like a Windows native Combobox dropdow menu.
     // This behavior includes accepting the pending item and closing on F4.
     COMBOBOX  = 1 << 4,
+
+    // A child view is performing a drag-and-drop operation, so the menu should
+    // stay open (even if it doesn't receive drag updated events). In this case,
+    // the caller is responsible for closing the menu upon completion of the
+    // drag-and-drop.
+    NESTED_DRAG = 1 << 5,
   };
 
   enum RunResult {