mash: Port mojo:ash_sysui's ContextMenuMus to mojo:ash.

ash/mus/native_widget_factory_mus.cc

+// Copyright 2016 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 "ash/mus/native_widget_factory_mus.h"
+
+#include "ash/common/wm_shell.h"
+#include "ash/mus/bridge/wm_window_mus.h"
+#include "ash/mus/window_manager.h"
+#include "services/ui/public/cpp/property_type_converters.h"
+#include "ui/views/mus/native_widget_mus.h"
+#include "ui/views/views_delegate.h"
+#include "ui/views/widget/widget.h"
+
+namespace ash {
+namespace mus {
+
+namespace {
+
+views::NativeWidget* CreateNativeWidgetMus(
+    WindowManager* window_manager,
+    const views::Widget::InitParams& init_params,
+    views::internal::NativeWidgetDelegate* delegate) {
+  // TYPE_CONTROL widgets require a NativeWidgetAura. So we let this fall

[sky, 2016/08/25 00:00:32]

I'm not sure this comment is really valid here, but we'll see...

[msw, 2016/08/25 00:25:14]

Acknowledged. Sorry that I'm quite familiar with this bit.

+  // through, so that the default NativeWidgetPrivate::CreateNativeWidget() is
+  // used instead.
+  if (init_params.type == views::Widget::InitParams::TYPE_CONTROL)
+    return nullptr;
+  std::map<std::string, std::vector<uint8_t>> props;
+  views::NativeWidgetMus::ConfigurePropertiesForNewWindow(init_params, &props);
+  return new views::NativeWidgetMus(delegate,
+                                    window_manager->NewTopLevelWindow(&props),
+                                    ui::mojom::SurfaceType::DEFAULT);
+}
+
+}  // namespace
+
+NativeWidgetFactoryMus::NativeWidgetFactoryMus(WindowManager* window_manager) {
+  views::ViewsDelegate::GetInstance()->set_native_widget_factory(
+      base::Bind(&CreateNativeWidgetMus, window_manager));
+}
+
+NativeWidgetFactoryMus::~NativeWidgetFactoryMus() {
+  if (views::ViewsDelegate::GetInstance()) {
+    views::ViewsDelegate::GetInstance()->set_native_widget_factory(
+        views::ViewsDelegate::NativeWidgetFactory());
+  }
+}
+
+}  // namespace mus
+}  // namespace ash