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diff --git a/components/mus/public/cpp/window_tree_connection.h b/components/mus/public/cpp/window_tree_connection.h
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+++ b/components/mus/public/cpp/window_tree_connection.h
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+// Copyright 2014 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_PUBLIC_CPP_WINDOW_TREE_CONNECTION_H_
+#define COMPONENTS_MUS_PUBLIC_CPP_WINDOW_TREE_CONNECTION_H_
+
+#include <string>
+
+#include "components/mus/public/cpp/types.h"
+#include "components/mus/public/interfaces/view_tree.mojom.h"
+#include "third_party/mojo/src/mojo/public/cpp/bindings/interface_request.h"
+
+#if defined(OS_WIN)
+// Windows headers define a macro for CreateWindow.
+#if defined(CreateWindow)
+#undef CreateWindow
+#endif
+#endif
+
+namespace mus {
+
+class Window;
+class WindowTreeDelegate;
+
+// Encapsulates a connection to a view tree. A unique connection is made
+// every time an app is embedded.
+class WindowTreeConnection {
+ public:
+  enum class CreateType {
+    // Indicates Create() should wait for OnEmbed(). If true, the
+    // WindowTreeConnection returned from Create() will have its root, otherwise
+    // the WindowTreeConnection will get the root at a later time.
+    WAIT_FOR_EMBED,
+    DONT_WAIT_FOR_EMBED
+  };
+
+  virtual ~WindowTreeConnection() {}
+
+  // The returned WindowTreeConnection instance owns itself, and is deleted when
+  // the last root is destroyed or the connection to the service is broken.
+  static WindowTreeConnection* Create(
+      WindowTreeDelegate* delegate,
+      mojo::InterfaceRequest<mojo::ViewTreeClient> request,
+      CreateType create_type);
+
+  // Returns the root of this connection.
+  virtual Window* GetRoot() = 0;
+
+  // Returns a View known to this connection.
+  virtual Window* GetWindowById(Id id) = 0;
+
+  // Returns the focused view; null if focus is not yet known or another app is
+  // focused.
+  virtual Window* GetFocusedWindow() = 0;
+
+  // Creates and returns a new View (which is owned by the ViewManager). Views
+  // are initially hidden, use SetVisible(true) to show.
+  virtual Window* CreateWindow() = 0;
+
+  // Returns true if ACCESS_POLICY_EMBED_ROOT was specified.
+  virtual bool IsEmbedRoot() = 0;
+
+  // Returns the id for this connection.
+  virtual ConnectionSpecificId GetConnectionId() = 0;
+};
+
+}  // namespace mus
+
+#endif  // COMPONENTS_MUS_PUBLIC_CPP_WINDOW_TREE_CONNECTION_H_