Disable flaky mac test: WidgetObserverTest.ActivationChange

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 792 matching lines @@
   Widget* widget_closed_;
   Widget* widget_activated_;
   Widget* widget_deactivated_;
   Widget* widget_shown_;
   Widget* widget_hidden_;
   Widget* widget_bounds_changed_;
 
   Widget* widget_to_close_on_hide_;
 };
 
-TEST_F(WidgetObserverTest, ActivationChange) {
+// This test appears to be flaky on Mac.
+#if defined(OS_MACOSX)
+#define MAYBE_ActivationChange DISABLED_ActivationChange
+#else
+#define MAYBE_ActivationChange ActivationChange
+#endif
+
+TEST_F(WidgetObserverTest, MAYBE_ActivationChange) {
   WidgetAutoclosePtr toplevel(CreateTopLevelPlatformWidget());
   WidgetAutoclosePtr toplevel1(NewWidget());
   WidgetAutoclosePtr toplevel2(NewWidget());
 
   toplevel1->Show();
   toplevel2->Show();
 
   reset();
 
   toplevel1->Activate();
@@ skipping 3111 matching lines @@
 }
 
 TEST_F(CompositingWidgetTest, Transparency_DesktopWidgetTranslucent) {
   CheckAllWidgetsForOpacity(Widget::InitParams::TRANSLUCENT_WINDOW);
 }
 
 #endif  // !defined(OS_CHROMEOS)
 
 }  // namespace test
 }  // namespace views