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diff --git a/chromium/ui/views/mus/remote_view/remote_view_host.h b/chromium/ui/views/mus/remote_view/remote_view_host.h
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+++ b/chromium/ui/views/mus/remote_view/remote_view_host.h
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+// Copyright 2018 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 UI_VIEWS_MUS_REMOTE_VIEW_REMOTE_VIEW_HOST_H_
+#define UI_VIEWS_MUS_REMOTE_VIEW_REMOTE_VIEW_HOST_H_
+
+#include <memory>
+
+#include "base/callback_forward.h"
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "base/unguessable_token.h"
+#include "ui/aura/window.h"
+#include "ui/views/controls/native/native_view_host.h"
+
+namespace views {
+
+// A view at the embedder side to embed an aura::Window from another window
+// tree. Note this only works with mus.
+class RemoteViewHost : public views::NativeViewHost {
+ public:
+  RemoteViewHost();
+  ~RemoteViewHost() override;
+
+  // Embeds the remote contents after this view is added to a widget.
+  // |embed_token| is the token obtained from the WindowTree embed API
+  // (ScheduleEmbed/ForExistingClient). |embed_flags| are the embedding flags
+  // (see window_tree_constants.mojom). |callback| is an optional callback
+  // invoked with the embed result.
+  // Note that |callback| should not be used to add the view to a widget because
+  // the actual embedding only happens after the view is added.
+  using EmbedCallback = base::OnceCallback<void(bool success)>;
+  void EmbedUsingToken(const base::UnguessableToken& embed_token,
+                       int embed_flags,
+                       EmbedCallback callback);
+
+ private:
+  // Creates the embedding aura::Window and attach to it.
+  void CreateEmbeddingRoot();
+
+  // Invoked after the embed operation.
+  void OnEmbedResult(bool success);
+
+  // views::NativeViewHost:
+  void AddedToWidget() override;
+
+  base::UnguessableToken embed_token_;
+  int embed_flags_ = 0;
+  EmbedCallback embed_callback_;
+
+  std::unique_ptr<aura::Window> embedding_root_;
+  base::WeakPtrFactory<RemoteViewHost> weak_ptr_factory_{this};
+
+  DISALLOW_COPY_AND_ASSIGN(RemoteViewHost);
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_MUS_REMOTE_VIEW_REMOTE_VIEW_HOST_H_