mus: Introduce AttachSurface to allow creating Surface prior to OnEmbed

components/mus/public/cpp/lib/window_tree_client_impl.h

 // 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_TREE_CLIENT_IMPL_H_
 #define COMPONENTS_MUS_PUBLIC_CPP_LIB_WINDOW_TREE_CLIENT_IMPL_H_
 
 #include <map>
 
 #include "components/mus/common/types.h"
@@ skipping 63 matching lines @@
   void SetWindowTextInputState(Id window_id, mojo::TextInputStatePtr state);
   void SetImeVisibility(Id window_id,
                         bool visible,
                         mojo::TextInputStatePtr state);
 
   void Embed(Id window_id,
              mojom::WindowTreeClientPtr client,
              uint32_t policy_bitmask,
              const mojom::WindowTree::EmbedCallback& callback);
 
-  void RequestSurface(Id window_id,
-                      mojom::SurfaceType type,
-                      mojo::InterfaceRequest<mojom::Surface> surface,
-                      mojom::SurfaceClientPtr client);
+  void AttachSurface(Id window_id,
+                     mojom::SurfaceType type,
+                     mojo::InterfaceRequest<mojom::Surface> surface,
+                     mojom::SurfaceClientPtr client);
 
   void set_change_acked_callback(const mojo::Callback<void(void)>& callback) {
     change_acked_callback_ = callback;
   }
   void ClearChangeAckedCallback() { change_acked_callback_.reset(); }
 
   // Start/stop tracking windows. While tracked, they can be retrieved via
   // WindowTreeConnection::GetWindowById.
   void AddWindow(Window* window);
   void RemoveWindow(Id window_id);
@@ skipping 121 matching lines @@
   bool is_embed_root_;
 
   bool in_destructor_;
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(WindowTreeClientImpl);
 };
 
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_PUBLIC_CPP_LIB_WINDOW_TREE_CLIENT_IMPL_H_