MacViews: Get widget_interactive_uitest compiling on Mac

ui/views/test/widget_test_aura.cc

Index: ui/views/test/widget_test_aura.cc
diff --git a/ui/views/test/widget_test_aura.cc b/ui/views/test/widget_test_aura.cc
index 1b2dd139fc10fc2c06caee0c9f3b0847fcfd0462..aceefffd6993be262c54da6823df88ff4947ab3c 100644
--- a/ui/views/test/widget_test_aura.cc
+++ b/ui/views/test/widget_test_aura.cc
@@ -4,6 +4,7 @@
 
 #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"
@@ -26,5 +27,11 @@ 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