MacViews: Fix gn check fail for mac_views_browser on Aura dependencies.

ui/views/widget/widget_unittest.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 <algorithm>
 #include <memory>
 #include <set>
 
 #include "base/bind.h"
 #include "base/macros.h"
@@ skipping 18 matching lines @@
 #include "ui/views/test/widget_test.h"
 #include "ui/views/widget/native_widget_delegate.h"
 #include "ui/views/widget/native_widget_private.h"
 #include "ui/views/widget/root_view.h"
 #include "ui/views/widget/widget_deletion_observer.h"
 #include "ui/views/widget/widget_removals_observer.h"
 #include "ui/views/window/dialog_delegate.h"
 #include "ui/views/window/native_frame_view.h"
 
 #if defined(OS_WIN)
-#include "ui/aura/window.h"
-#include "ui/aura/window_tree_host.h"
+#include "ui/aura/window.h"            // nogncheck
+#include "ui/aura/window_tree_host.h"  // nogncheck

[tapted, 2016/09/19 03:23:36]

So the "alternative" to // nogncheck is to move the code that requires these
headers into a separate file. We should investigate all the cases in this CL -
it might not make sense to do that in all cases, but widget_unittest is probably
a good place to try it out. For example, the tests here that rely on these aura
headers might:
 - belong instead in native_widget_aura_unittest.cc, OR
 - sill be widget tests, but aura-specific so belong in a new file like
widget_aura_unittest.cc, OR
 - need to be enabled on Mac but are missing the right abstraction (e.g. a
generic interface in widget_test.h [similar to IsNativeWindowVisible()] that is
implemented in widget_test_mac.mm and widget_test_aura.cc

 #include "ui/base/view_prop.h"
 #include "ui/base/win/window_event_target.h"
 #include "ui/views/win/hwnd_util.h"
 #endif
 
 #if defined(OS_MACOSX)
 #include "base/mac/mac_util.h"
 #endif
 
 namespace views {
@@ skipping 3777 matching lines @@
     Transparency_DesktopWidgetTranslucent
 #endif
 TEST_F(CompositingWidgetTest, MAYBE_Transparency_DesktopWidgetTranslucent) {
   CheckAllWidgetsForOpacity(Widget::InitParams::TRANSLUCENT_WINDOW);
 }
 
 #endif  // !defined(OS_CHROMEOS)
 
 }  // namespace test
 }  // namespace views