Positions the launcher in the bottom left corner. Adds ShellDelegate

ui/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 "ui/aura/desktop.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "ui/aura/desktop_delegate.h"
@@ skipping 142 matching lines @@
 void Desktop::WindowDestroying(Window* window) {
   if (in_destructor_ || window != active_window_)
     return;
 
   // Reset active_window_ before invoking SetActiveWindow so that we don't
   // attempt to notify it while running its destructor.
   active_window_ = NULL;
   SetActiveWindow(delegate_->GetTopmostWindowToActivate(window), NULL);
 }
 
+void Desktop::WindowAdded(Window* window) {
+  if (delegate_.get())
+    delegate_->WindowAdded(window);
+}
+
+void Desktop::WillRemoveWindow(Window* window) {
+  if (delegate_.get())
+    delegate_->WillRemoveWindow(window);
+}
+
 MessageLoop::Dispatcher* Desktop::GetDispatcher() {
   return host_.get();
 }
 
 // static
 Desktop* Desktop::GetInstance() {
   if (!instance_) {
     instance_ = new Desktop;
     instance_->Init();
   }
   return instance_;
 }
 
 }  // namespace aura