Initial vulkan context and immediate drawer.

Extremely rough, just checking in so DrChat can snoop.

src/xenia/ui/vulkan/vulkan_window_demo.cc

@@ -0,0 +1,30 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2016 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include <string>
+#include <vector>
+
+#include "xenia/base/main.h"
+#include "xenia/ui/vulkan/vulkan_provider.h"
+#include "xenia/ui/window.h"
+
+namespace xe {
+namespace ui {
+
+int window_demo_main(const std::vector<std::wstring>& args);
+
+std::unique_ptr<GraphicsProvider> CreateDemoGraphicsProvider(Window* window) {
+  return xe::ui::vulkan::VulkanProvider::Create(window);
+}
+
+}  // namespace ui
+}  // namespace xe
+
+DEFINE_ENTRY_POINT(L"xenia-ui-window-vulkan-demo",
+                   L"xenia-ui-window-vulkan-demo", xe::ui::window_demo_main);