Add the beginning of a simple window manager that we'll support on Windows.

mash/login/login.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 "mash/login/login.h"
 
 #include <map>
 #include <memory>
 
 #include "ash/public/cpp/shell_window_ids.h"
 #include "base/guid.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
+#include "mash/common/config.h"
 #include "mash/init/public/interfaces/constants.mojom.h"
 #include "mash/init/public/interfaces/init.mojom.h"
 #include "mash/login/public/interfaces/login.mojom.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
 #include "services/service_manager/public/cpp/connector.h"
 #include "services/service_manager/public/cpp/interface_factory.h"
 #include "services/service_manager/public/cpp/interface_registry.h"
 #include "services/service_manager/public/cpp/service.h"
 #include "services/service_manager/public/cpp/service_context.h"
 #include "services/tracing/public/cpp/provider.h"
@@ skipping 84 matching lines @@
     login_button_1_->SetBounds(button_box.x(), button_box.y(), ps1.width(),
                                ps1.height());
     login_button_2_->SetBounds(login_button_1_->bounds().right() + 10,
                                button_box.y(), ps2.width(), ps2.height());
   }
 
   // Overridden from views::ButtonListener:
   void ButtonPressed(views::Button* sender, const ui::Event& event) override;
 
   void StartWindowManager(const service_manager::Identity& identity) {
-    mash_wm_connection_ = connector_->Connect("ash");
+    mash_wm_connection_ =
+        connector_->Connect(common::GetWindowManagerServiceName());
     mash_wm_connection_->SetConnectionLostClosure(
         base::Bind(&UI::StartWindowManager, base::Unretained(this), identity));
     window_manager_connection_ =
         views::WindowManagerConnection::Create(connector_, identity);
   }
 
   Login* login_;
   service_manager::Connector* connector_;
   const std::string user_id_1_;
   const std::string user_id_2_;
@@ skipping 77 matching lines @@
 }
 
 }  // namespace
 
 service_manager::Service* CreateLogin() {
   return new Login;
 }
 
 }  // namespace login
 }  // namespace main