Restructure login

ui/views/mus/window_manager_connection.cc

 // Copyright 2015 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/views/mus/window_manager_connection.h"
 
 #include <utility>
 
 #include "base/lazy_instance.h"
 #include "base/threading/thread_local.h"
@@ skipping 26 matching lines @@
 }
 
 // static
 WindowManagerConnection* WindowManagerConnection::Get() {
   WindowManagerConnection* connection = lazy_tls_ptr.Pointer()->Get();
   DCHECK(connection);
   return connection;
 }
 
 // static
+bool WindowManagerConnection::Exists() {
+  return !!lazy_tls_ptr.Pointer()->Get();
+}
+
+// static
 void WindowManagerConnection::Reset() {
   delete Get();
   lazy_tls_ptr.Pointer()->Set(nullptr);
 }
 
 mus::Window* WindowManagerConnection::NewWindow(
     const std::map<std::string, std::vector<uint8_t>>& properties) {
   return window_tree_connection_->NewTopLevelWindow(&properties);
 }
 
@@ skipping 31 matching lines @@
 
 void WindowManagerConnection::OnConnectionLost(
     mus::WindowTreeConnection* connection) {}
 
 void WindowManagerConnection::OnWindowManagerFrameValuesChanged() {
   if (window_tree_connection_)
     NativeWidgetMus::NotifyFrameChanged(window_tree_connection_.get());
 }
 
 }  // namespace views