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

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/window.h"
+#include "ui/aura/window_tree_host.h"
+#include "ui/views/widget/widget.h"
+
+namespace views {
+namespace test {
+
+// static
+bool WidgetTest::IsNativeWindowVisible(gfx::NativeWindow window) {
+  return window->IsVisible();
+}
+
+// static
+ui::EventProcessor* WidgetTest::GetEventProcessor(Widget* widget) {
+  return widget->GetNativeWindow()->GetHost()->event_processor();
+}
+
+}  // namespace test
+}  // namespace views