mus: Introduce AttachSurface to allow creating Surface prior to OnEmbed

components/mus/ws/window_tree_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_WS_WINDOW_TREE_IMPL_H_
 #define COMPONENTS_MUS_WS_WINDOW_TREE_IMPL_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 208 matching lines @@
   void SetWindowBounds(uint32_t change_id,
                        Id window_id,
                        mojo::RectPtr bounds) override;
   void SetWindowVisibility(Id window_id,
                            bool visible,
                            const mojo::Callback<void(bool)>& callback) override;
   void SetWindowProperty(uint32_t change_id,
                          Id window_id,
                          const mojo::String& name,
                          mojo::Array<uint8_t> value) override;
-  void RequestSurface(Id window_id,
-                      mojom::SurfaceType type,
-                      mojo::InterfaceRequest<mojom::Surface> surface,
-                      mojom::SurfaceClientPtr client) override;
+  void AttachSurface(Id window_id,
+                     mojom::SurfaceType type,
+                     mojo::InterfaceRequest<mojom::Surface> surface,
+                     mojom::SurfaceClientPtr client) override;
   void Embed(Id transport_window_id,
              mojom::WindowTreeClientPtr client,
              uint32_t policy_bitmask,
              const EmbedCallback& callback) override;
   void SetFocus(uint32_t window_id) override;
   void SetCanFocus(uint32_t window_id, bool can_focus) override;
   void SetWindowTextInputState(uint32_t window_id,
                                mojo::TextInputStatePtr state) override;
   void SetImeVisibility(Id transport_window_id,
                         bool visible,
@@ skipping 35 matching lines @@
   bool is_embed_root_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowTreeImpl);
 };
 
 }  // namespace ws
 
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_WS_WINDOW_TREE_IMPL_H_