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diff --git a/components/mus/public/cpp/lib/window_private.h b/components/mus/public/cpp/lib/window_private.h
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+++ b/components/mus/public/cpp/lib/window_private.h
@@ -0,0 +1,68 @@
+// 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_LIB_WINDOW_PRIVATE_H_
+#define COMPONENTS_MUS_PUBLIC_CPP_LIB_WINDOW_PRIVATE_H_
+
+#include "components/mus/public/cpp/window.h"
+
+namespace mus {
+
+// This class is a friend of a View and contains functions to mutate internal
+// state of View.
+class WindowPrivate {
+ public:
+  explicit WindowPrivate(Window* view);
+  ~WindowPrivate();
+
+  // Creates and returns a new View. Caller owns the return value.
+  static Window* LocalCreate();
+
+  base::ObserverList<WindowObserver>* observers() {
+    return &window_->observers_;
+  }
+
+  void ClearParent() { window_->parent_ = NULL; }
+
+  void set_visible(bool visible) { window_->visible_ = visible; }
+
+  void set_drawn(bool drawn) { window_->drawn_ = drawn; }
+
+  void set_id(Id id) { window_->id_ = id; }
+
+  void set_connection(WindowTreeConnection* connection) {
+    window_->connection_ = connection;
+  }
+
+  void set_properties(const std::map<std::string, std::vector<uint8_t>>& data) {
+    window_->properties_ = data;
+  }
+
+  void LocalSetViewportMetrics(const mojo::ViewportMetrics& old_metrics,
+                               const mojo::ViewportMetrics& new_metrics) {
+    window_->LocalSetViewportMetrics(new_metrics, new_metrics);
+  }
+
+  void LocalDestroy() { window_->LocalDestroy(); }
+  void LocalAddChild(Window* child) { window_->LocalAddChild(child); }
+  void LocalRemoveChild(Window* child) { window_->LocalRemoveChild(child); }
+  void LocalReorder(Window* relative, mojo::OrderDirection direction) {
+    window_->LocalReorder(relative, direction);
+  }
+  void LocalSetBounds(const mojo::Rect& old_bounds,
+                      const mojo::Rect& new_bounds) {
+    window_->LocalSetBounds(old_bounds, new_bounds);
+  }
+  void LocalSetDrawn(bool drawn) { window_->LocalSetDrawn(drawn); }
+  void LocalSetVisible(bool visible) { window_->LocalSetVisible(visible); }
+
+ private:
+  Window* window_;
+
+  MOJO_DISALLOW_COPY_AND_ASSIGN(WindowPrivate);
+};
+
+}  // namespace mus
+
+#endif  // COMPONENTS_MUS_PUBLIC_CPP_LIB_WINDOW_PRIVATE_H_