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

aura/desktop.cc

+// 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 <algorithm>
+
+#include "aura/window.h"
+#include "base/logging.h"
+#include "ui/gfx/compositor/compositor.h"
+
+namespace aura {
+
+Desktop::Desktop(gfx::AcceleratedWidget widget, const gfx::Size& size)
+    : compositor_(ui::Compositor::Create(widget, size)) {
+  DCHECK(compositor_.get());
+}
+
+Desktop::~Desktop() {
+}
+
+void Desktop::Draw() {
+  // First pass updates the layer bitmaps.
+  for (Windows::iterator i = windows_.begin(); i != windows_.end(); ++i)
+    (*i)->UpdateLayerCanvas();
+
+  // Second pass renders the layers.
+  compositor_->NotifyStart();
+  for (Windows::iterator i = windows_.begin(); i != windows_.end(); ++i)
+    (*i)->Draw();
+  compositor_->NotifyEnd();
+}
+
+void Desktop::AddWindow(Window* window) {
+  DCHECK(std::find(windows_.begin(), windows_.end(), window) == windows_.end());
+  windows_.push_back(window);
+}
+
+void Desktop::RemoveWindow(Window* window) {
+  Windows::iterator i = std::find(windows_.begin(), windows_.end(), window);
+  DCHECK(i != windows_.end());
+  windows_.erase(i);
+}
+
+}  // namespace aura