Positions the launcher in the bottom left corner. Adds ShellDelegate

ui/aura/desktop.cc

Index: ui/aura/desktop.cc
diff --git a/ui/aura/desktop.cc b/ui/aura/desktop.cc
index 565628e5139741a1a1e3a37d23dfaed8377fe132..f5b8dbec2736f60ce77bb6cfd6d92a7dee04fa09 100644
--- a/ui/aura/desktop.cc
+++ b/ui/aura/desktop.cc
@@ -160,6 +160,16 @@ void Desktop::WindowDestroying(Window* window) {
   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();
 }