make menus, bubbles, etc. top level windows on aura

ui/views/widget/widget.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/widget/widget.h"
 
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/utf_string_conversions.h"
@@ skipping 328 matching lines @@
 
 void Widget::Init(const InitParams& in_params) {
   TRACE_EVENT0("views", "Widget::Init");
   InitParams params = in_params;
 
   is_top_level_ = params.top_level ||
       (!params.child &&
        params.type != InitParams::TYPE_CONTROL &&
        params.type != InitParams::TYPE_TOOLTIP);
   params.top_level = is_top_level_;
+#if defined(OS_WIN) && defined(USE_AURA)
+  // It'll need to be faded in if it's top level and not the main window.
+  params.transparent = is_top_level_ && params.type != InitParams::TYPE_WINDOW;
+#endif
 
   if (ViewsDelegate::views_delegate)
     ViewsDelegate::views_delegate->OnBeforeWidgetInit(&params, this);
 
   widget_delegate_ = params.delegate ?
       params.delegate : new DefaultWidgetDelegate(this, params);
   ownership_ = params.ownership;
   native_widget_ = CreateNativeWidget(params.native_widget, this)->
                    AsNativeWidgetPrivate();
   root_view_.reset(CreateRootView());
@@ skipping 1062 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // internal::NativeWidgetPrivate, NativeWidget implementation:
 
 internal::NativeWidgetPrivate* NativeWidgetPrivate::AsNativeWidgetPrivate() {
   return this;
 }
 
 }  // namespace internal
 }  // namespace views