[win] Initialize the app list menu lazily, and allow invalidation.

ui/app_list/views/app_list_view.cc

 // Copyright (c) 2012 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/app_list/views/app_list_view.h"
 
 #include "base/command_line.h"
 #include "base/strings/string_util.h"
 #include "ui/app_list/app_list_constants.h"
 #include "ui/app_list/app_list_model.h"
@@ skipping 161 matching lines @@
 void AppListView::Prerender() {
   app_list_main_view_->Prerender();
 }
 
 void AppListView::OnSigninStatusChanged() {
   const bool needs_signin =
       GetSigninDelegate() && GetSigninDelegate()->NeedSignin();
 
   signin_view_->SetVisible(needs_signin);
   app_list_main_view_->SetVisible(!needs_signin);
+  app_list_main_view_->search_box_view()->InvalidateMenu();
 }
 
 views::View* AppListView::GetInitiallyFocusedView() {
   return app_list_main_view_->search_box_view()->search_box();
 }
 
 gfx::ImageSkia AppListView::GetWindowIcon() {
   if (delegate_)
     return delegate_->GetWindowIcon();
 
@@ skipping 64 matching lines @@
 
 void AppListView::OnSigninSuccess() {
   OnSigninStatusChanged();
 }
 
 SigninDelegate* AppListView::GetSigninDelegate() {
   return delegate_ ? delegate_->GetSigninDelegate() : NULL;
 }
 
 }  // namespace app_list