Add tests to verify accelerators properly work on constrained window.

ui/views/test/test_widget_observer.h

+// 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.
+
+#ifndef UI_VIEWS_TEST_TEST_WIDGET_OBSERVER_H_
+#define UI_VIEWS_TEST_TEST_WIDGET_OBSERVER_H_
+
+#include <stddef.h>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "ui/views/widget/widget_observer.h"
+
+namespace views {
+namespace test {
+
+// A Widget observer class used in the tests below to observe bubbles closing.
+class TestWidgetObserver : public WidgetObserver {
+ public:
+  explicit TestWidgetObserver(Widget* widget);
+  virtual ~TestWidgetObserver();
+
+  bool widget_closed() const { return widget_ == NULL; }
+
+ private:
+  // WidgetObserver overrides:
+  virtual void OnWidgetClosing(Widget* widget) OVERRIDE;
+
+  Widget* widget_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestWidgetObserver);
+};
+
+}  // namespace test
+}  // namespace views
+
+#endif  // UI_VIEWS_TEST_TEST_WIDGET_OBSERVER_H_