Refactors keyboard related code so mash can use a keyboard

ash/mus/sysui_application.cc

 // Copyright 2016 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 "ash/mus/sysui_application.h"
 
 #include "ash/desktop_background/desktop_background_controller.h"
 #include "ash/host/ash_window_tree_host_init_params.h"
 #include "ash/host/ash_window_tree_host_platform.h"
+#include "ash/mus/keyboard_ui_mus.h"
 #include "ash/mus/shell_delegate_mus.h"
 #include "ash/mus/stub_context_factory.h"
 #include "ash/root_window_settings.h"
 #include "ash/shell.h"
 #include "ash/shell_init_params.h"
 #include "ash/shell_window_ids.h"
+#include "base/bind.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "components/mus/public/cpp/property_type_converters.h"
 #include "mash/wm/public/interfaces/container.mojom.h"
 #include "ui/aura/env.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/base/ui_base_paths.h"
 #include "ui/message_center/message_center.h"
 #include "ui/platform_window/stub/stub_window.h"
 #include "ui/views/mus/aura_init.h"
 #include "ui/views/mus/native_widget_mus.h"
@@ skipping 142 matching lines @@
 
     ash::AshWindowTreeHost::SetFactory(base::Bind(&CreateWindowTreeHostMus));
     ash_delegate_ = new ShellDelegateMus;
 
     InitializeComponents();
 
     ash::ShellInitParams init_params;
     init_params.delegate = ash_delegate_;
     init_params.context_factory = new StubContextFactory;
     init_params.blocking_pool = worker_pool_.get();
+    init_params.in_mus = true;
+    init_params.keyboard_factory = base::Bind(&KeyboardUIMus::Create, shell);
     ash::Shell::CreateInstance(init_params);
     ash::Shell::GetInstance()->CreateShelf();
     ash::Shell::GetInstance()->UpdateAfterLoginStatusChange(
         ash::user::LOGGED_IN_USER);
 
     ash::Shell::GetPrimaryRootWindow()->GetHost()->Show();
     SetupWallpaper(SkColorSetARGB(255, 0, 255, 0));
   }
 
   void SetupWallpaper(SkColor color) {
@@ skipping 43 matching lines @@
 
 void SysUIApplication::Initialize(mojo::Shell* shell,
                                   const std::string& url,
                                   uint32_t id) {
   ash_init_.reset(new AshInit());
   ash_init_->Initialize(shell);
 }
 
 }  // namespace sysui
 }  // namespace ash