Shell of implementation for embedded windows. At this point this is

aura/demo/demo_main.cc

Index: aura/demo/demo_main.cc
diff --git a/aura/demo/demo_main.cc b/aura/demo/demo_main.cc
new file mode 100644
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+++ b/aura/demo/demo_main.cc
@@ -0,0 +1,78 @@
+// Copyright (c) 2011 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 "aura/desktop.h"
+#include "aura/desktop_host.h"
+#include "aura/window.h"
+#include "aura/window_delegate.h"
+#include "base/at_exit.h"
+#include "base/command_line.h"
+#include "base/i18n/icu_util.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop.h"
+#include "third_party/skia/include/core/SkXfermode.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/gfx/canvas.h"
+#include "ui/gfx/canvas_skia.h"
+#include "ui/gfx/rect.h"
+#include "ui/base/ui_base_paths.h"
+
+namespace {
+
+// Trivial WindowDelegate implementation that draws a blue background.
+class DemoWindowDelegate : public aura::WindowDelegate {
+ public:
+  explicit DemoWindowDelegate(aura::Window* window);
+
+  virtual void OnPaint(const gfx::Rect& bounds) OVERRIDE;
+
+ private:
+  aura::Window* window_;
+
+  DISALLOW_COPY_AND_ASSIGN(DemoWindowDelegate);
+};
+
+DemoWindowDelegate::DemoWindowDelegate(aura::Window* window)
+    : window_(window) {
+}
+
+void DemoWindowDelegate::OnPaint(const gfx::Rect& bounds) {
+  scoped_ptr<gfx::Canvas> canvas(
+      gfx::Canvas::CreateCanvas(bounds.width(), bounds.height(), false));
+  canvas->AsCanvasSkia()->drawColor(
+      SK_ColorBLUE, SkXfermode::kSrc_Mode);
+  window_->SetCanvas(*canvas->AsCanvasSkia(), bounds.origin());
+}
+
+}  // namespace
+
+int main(int argc, char** argv) {
+  CommandLine::Init(argc, argv);
+
+  // The exit manager is in charge of calling the dtors of singleton objects.
+  base::AtExitManager exit_manager;
+
+  ui::RegisterPathProvider();
+  icu_util::Initialize();
+  ResourceBundle::InitSharedInstance("en-US");
+
+  // Create the DesktopHost and Desktop.
+  scoped_ptr<aura::DesktopHost> host(
+      aura::DesktopHost::Create(gfx::Rect(200, 200, 1024, 768)));
+  aura::Desktop desktop(host->GetAcceleratedWidget(), host->GetSize());
+  host->SetDesktop(&desktop);
+
+  // Create a test window and give it a size.
+  aura::Window window(&desktop);
+  window.SetBounds(gfx::Rect(100, 100, 400, 400), 0);
+  window.SetVisibility(aura::Window::VISIBILITY_SHOWN);
+  DemoWindowDelegate window_delegate(&window);
+  window.set_delegate(&window_delegate);
+
+  host->Show();
+
+  MessageLoop main_message_loop(MessageLoop::TYPE_UI);
+  MessageLoopForUI::current()->Run(NULL);
+  return 0;
+}