ash/mash: Fix painting of status-tray bubble.

ui/views/mus/native_widget_mus_unittest.cc

 // Copyright 2016 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/mus/native_widget_mus.h"
 
 #include "base/macros.h"
 #include "components/mus/public/cpp/property_type_converters.h"
 #include "components/mus/public/cpp/window.h"
 #include "components/mus/public/cpp/window_property.h"
 #include "components/mus/public/interfaces/window_manager.mojom.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkColor.h"
+#include "ui/aura/window.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/image/image_skia.h"
 #include "ui/gfx/skia_util.h"
 #include "ui/views/test/views_test_base.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_delegate.h"
 
 namespace views {
 namespace {
 
@@ skipping 92 matching lines @@
   widget->UpdateWindowIcon();
 
   // The window has the updated icon.
   mus::Window* window =
       static_cast<NativeWidgetMus*>(widget->native_widget_private())->window();
   SkBitmap icon = window->GetSharedProperty<SkBitmap>(
       mus::mojom::WindowManager::kWindowAppIcon_Property);
   EXPECT_TRUE(gfx::BitmapsAreEqual(bitmap2, icon));
 }
 
+TEST_F(NativeWidgetMusTest, ValidLayerTree) {
+  scoped_ptr<Widget> widget(CreateWidget(nullptr));
+  View* content = new View;
+  content->SetPaintToLayer(true);
+  widget->GetContentsView()->AddChildView(content);
+  EXPECT_TRUE(widget->GetNativeWindow()->layer()->Contains(content->layer()));
+}
+
 }  // namespace
 }  // namespace views