Minimal Chrome Frame with Aura.

ui/views/widget/widget.cc

Index: ui/views/widget/widget.cc
diff --git a/ui/views/widget/widget.cc b/ui/views/widget/widget.cc
index a22691dfff740bc3499ad6b0f6f4e0cae1d664f8..9f0bfbcf2f09ece050a887c1a712539734184c4b 100644
--- a/ui/views/widget/widget.cc
+++ b/ui/views/widget/widget.cc
@@ -1026,6 +1026,8 @@ void Widget::OnNativeWidgetCreated() {
       widget_delegate_->GetAccessibleWindowState());
 
   native_widget_->InitModalType(widget_delegate_->GetModalType());
+
+  FOR_EACH_OBSERVER(WidgetObserver, observers_, OnWidgetCreated(this));
 }
 
 void Widget::OnNativeWidgetDestroying() {
@@ -1040,6 +1042,7 @@ void Widget::OnNativeWidgetDestroying() {
 }
 
 void Widget::OnNativeWidgetDestroyed() {
+  FOR_EACH_OBSERVER(WidgetObserver, observers_, OnWidgetDestroyed(this));
   widget_delegate_->DeleteDelegate();
   widget_delegate_ = NULL;
   native_widget_destroyed_ = true;