Move the concept of Activation to the Shell.

ui/aura/client/activation_delegate.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/client/activation_delegate.h"
+
+#include "ui/aura/client/aura_constants.h"
+#include "ui/aura/window.h"
+
+namespace aura {
+
+// static
+void ActivationDelegate::SetActivationDelegate(Window* window,
+                                               ActivationDelegate* delegate) {
+  window->SetProperty(kActivationDelegateKey, delegate);
+}
+
+// static
+ActivationDelegate* ActivationDelegate::GetActivationDelegate(Window* window) {
+  return reinterpret_cast<ActivationDelegate*>(
+      window->GetProperty(kActivationDelegateKey));
+}
+
+}  // namespace aura