MacViews: Add WidgetEventGenerator to abstract platform-specific event generation for tests.

ui/views/test/widget_event_generator_mac.h

+// 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.
+
+#ifndef UI_VIEWS_TEST_WIDGET_EVENT_GENERATOR_MAC_H_
+#define UI_VIEWS_TEST_WIDGET_EVENT_GENERATOR_MAC_H_
+
+#include "base/macros.h"
+#include "ui/events/test/event_generator.h"
+#include "ui/gfx/native_widget_types.h"
+
+namespace views {
+namespace test {
+
+// Encapsulates event generation for an NSWindow. This is a helper class that
+// creates a ui::test::EventGeneratorDelegate for the parent EventGenerator,
+// which returns wrapped EventTargets that redirect events to the NSWindow as
+// native, NSEvents. Only a single window is supported.
+class WidgetEventGeneratorMac : public ui::test::EventGenerator {
+ public:
+  explicit WidgetEventGeneratorMac(gfx::NativeWindow ns_window);
+  virtual ~WidgetEventGeneratorMac();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(WidgetEventGeneratorMac);
+};
+
+}  // namespace test
+}  // namespace views
+
+#endif  // UI_VIEWS_TEST_WIDGET_EVENT_GENERATOR_MAC_H_