Allow the user to drag an extension to the overflow menu, even when its empty

chrome/browser/ui/views/toolbar/extension_toolbar_menu_view.cc

Index: chrome/browser/ui/views/toolbar/extension_toolbar_menu_view.cc
diff --git a/chrome/browser/ui/views/toolbar/extension_toolbar_menu_view.cc b/chrome/browser/ui/views/toolbar/extension_toolbar_menu_view.cc
index d2dccd1ebf41a286f7210088a8273ff67f50e50d..cacad5ff06fd163dfca14ea5476bc012e9ab0296 100644
--- a/chrome/browser/ui/views/toolbar/extension_toolbar_menu_view.cc
+++ b/chrome/browser/ui/views/toolbar/extension_toolbar_menu_view.cc
@@ -44,6 +44,9 @@ ExtensionToolbarMenuView::ExtensionToolbarMenuView(Browser* browser,
       main);
   container_->Init();
   AddChildView(container_);
+  // We Layout() the container here so that we know the number of actions
+  // that will be visible in ShouldShow().
+  container_->Layout();
 
   // If we were opened for a drop command, we have to wait for the drop to
   // finish so we can close the wrench menu.
@@ -56,6 +59,11 @@ ExtensionToolbarMenuView::ExtensionToolbarMenuView(Browser* browser,
 ExtensionToolbarMenuView::~ExtensionToolbarMenuView() {
 }
 
+bool ExtensionToolbarMenuView::ShouldShow() {
+  return wrench_menu_->for_drop() ||
+      container_->VisibleBrowserActionsAfterAnimation();
+}
+
 gfx::Size ExtensionToolbarMenuView::GetPreferredSize() const {
   return container_->GetPreferredSize();
 }