Make DesktopWindowTreeHostX11::ShouldWindowContentsBeTransparent() relies on argb visual flag

ui/views/test/widget_test_aura.cc

 // Copyright 2014 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/test/widget_test.h"
 
 #include "build/build_config.h"
 #include "ui/aura/client/focus_client.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_delegate.h"
@@ skipping 96 matching lines @@
 ui::EventProcessor* WidgetTest::GetEventProcessor(Widget* widget) {
   return widget->GetNativeWindow()->GetHost()->event_processor();
 }
 
 // static
 ui::internal::InputMethodDelegate* WidgetTest::GetInputMethodDelegateForWidget(
     Widget* widget) {
   return widget->GetNativeWindow()->GetRootWindow()->GetHost();
 }
 
+// static
+bool WidgetTest::IsNativeWindowTransparent(gfx::NativeWindow window) {
+  return window->transparent();
+}
+
 }  // namespace test
 }  // namespace views