Adds WindowManagerManager to mus

components/mus/ws/window_manager_state.h

Index: components/mus/ws/window_manager_state.h
diff --git a/components/mus/ws/window_manager_state.h b/components/mus/ws/window_manager_state.h
new file mode 100644
index 0000000000000000000000000000000000000000..48c776d11ceff14fabce8b8989314c21ac043f9c
--- /dev/null
+++ b/components/mus/ws/window_manager_state.h
@@ -0,0 +1,58 @@
+// 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.
+
+#ifndef COMPONENTS_MUS_WS_WINDOW_MANAGER_STATE_H_
+#define COMPONENTS_MUS_WS_WINDOW_MANAGER_STATE_H_
+
+#include <stdint.h>
+
+#include "base/memory/scoped_ptr.h"
+
+namespace mus {
+namespace ws {
+
+class ServerWindow;
+class WindowTreeHostImpl;
+class WindowTreeImpl;
+
+// Manages the state associated with a connection to a WindowManager for
+// a specific user.
+class WindowManagerState {
+ public:
+  // Creates a WindowManagerState that can host content from any user.
+  explicit WindowManagerState(WindowTreeHostImpl* tree_host);
+  WindowManagerState(WindowTreeHostImpl* tree_host, uint32_t user_id);
+  ~WindowManagerState();
+
+  bool is_user_id_valid() const { return is_user_id_valid_; }
+
+  ServerWindow* root() { return root_.get(); }
+  const ServerWindow* root() const { return root_.get(); }
+
+  WindowTreeImpl* tree() { return tree_; }
+  const WindowTreeImpl* tree() const { return tree_; }
+
+ private:
+  friend class WindowTreeHostImpl;
+
+  WindowManagerState(WindowTreeHostImpl* tree_host,
+                     bool is_user_id_valid,
+                     uint32_t user_id);
+
+  WindowTreeHostImpl* tree_host_;
+  // If this was created implicitly by a call
+  // WindowTreeHostFactory::CreateWindowTreeHost(), then |is_user_id_valid_|
+  // is false.
+  const bool is_user_id_valid_;
+  const uint32_t user_id_;
+  scoped_ptr<ServerWindow> root_;
+  WindowTreeImpl* tree_ = nullptr;
+
+  DISALLOW_COPY_AND_ASSIGN(WindowManagerState);
+};
+
+}  // namespace ws
+}  // namespace mus
+
+#endif  // COMPONENTS_MUS_WS_WINDOW_MANAGER_STATE_H_