Add helpers for creating UI components.

mojo/ui/base_view.cc

+// Copyright 2015 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 "mojo/ui/base_view.h"
+
+#include "base/logging.h"
+
+namespace mojo {
+namespace ui {
+
+BaseView::BaseView(
+    mojo::ApplicationImpl* app_impl,
+    const std::string& label,
+    const mojo::ui::ViewProvider::CreateViewCallback& create_view_callback)
+    : app_impl_(app_impl), view_binding_(this) {
+  DCHECK(app_impl_);
+  app_impl_->ConnectToService("mojo:view_manager_service", &view_manager_);
+
+  mojo::ui::ViewPtr view;
+  view_binding_.Bind(mojo::GetProxy(&view));
+  view_manager_->RegisterView(view.Pass(), mojo::GetProxy(&view_host_), label,
+                              create_view_callback);
+  view_host_->CreateScene(mojo::GetProxy(&scene_));
+  view_host_->GetServiceProvider(mojo::GetProxy(&view_service_provider_));
+}
+
+BaseView::~BaseView() {}
+
+void BaseView::OnChildUnavailable(uint32_t child_key,
+                                  const OnChildUnavailableCallback& callback) {
+  callback.Run();
+}
+
+}  // namespace ui
+}  // namespace mojo