MacViews: Get widget_interactive_uitest compiling on Mac

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 "ui/aura/client/focus_client.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_tree_host.h"
 #include "ui/views/widget/widget.h"
 
 namespace views {
 namespace test {
 
 // static
 void WidgetTest::SimulateNativeDestroy(Widget* widget) {
   delete widget->GetNativeView();
 }
 
 // static
 bool WidgetTest::IsNativeWindowVisible(gfx::NativeWindow window) {
   return window->IsVisible();
 }
 
 // static
 ui::EventProcessor* WidgetTest::GetEventProcessor(Widget* widget) {
   return widget->GetNativeWindow()->GetHost()->event_processor();
 }
 
+// static
+gfx::NativeWindow WidgetTest::CurrentlyFocussedWindow(Widget* widget_context) {
+  return aura::client::GetFocusClient(widget_context->GetNativeWindow())
+      ->GetFocusedWindow();
+}
+
 }  // namespace test
 }  // namespace views