Promotes remaining global window manager state into WindowManagerState

components/mus/ws/window_manager_display_root.cc

Index: components/mus/ws/window_manager_display_root.cc
diff --git a/components/mus/ws/window_manager_display_root.cc b/components/mus/ws/window_manager_display_root.cc
new file mode 100644
index 0000000000000000000000000000000000000000..351208d4af6bc6cf55a2c02ee7dae6c46cfe9633
--- /dev/null
+++ b/components/mus/ws/window_manager_display_root.cc
@@ -0,0 +1,34 @@
+// 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 "components/mus/ws/window_manager_display_root.h"
+
+#include "components/mus/ws/display_manager.h"
+#include "components/mus/ws/server_window.h"
+#include "components/mus/ws/window_server.h"
+
+namespace mus {
+namespace ws {
+
+WindowManagerDisplayRoot::WindowManagerDisplayRoot(Display* display)
+    : display_(display) {
+  root_.reset(window_server()->CreateServerWindow(
+      window_server()->display_manager()->GetAndAdvanceNextRootId(),
+      ServerWindow::Properties()));
+  // Our root is always a child of the Display's root. Do this
+  // before the WindowTree has been created so that the client doesn't get
+  // notified of the add, bounds change and visibility change.
+  root_->SetBounds(gfx::Rect(display->root_window()->bounds().size()));
+  root_->SetVisible(true);
+  display->root_window()->Add(root_.get());
+}
+
+WindowManagerDisplayRoot::~WindowManagerDisplayRoot() {}
+
+WindowServer* WindowManagerDisplayRoot::window_server() {
+  return display_->window_server();
+}
+
+}  // namespace ws
+}  // namespace mus