mus: Introduce AttachSurface to allow creating Surface prior to OnEmbed

components/mus/ws/window_tree_impl.cc

 // 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.
 
 #include "components/mus/ws/window_tree_impl.h"
 
 #include "base/bind.h"
 #include "base/stl_util.h"
 #include "components/mus/ws/connection_manager.h"
 #include "components/mus/ws/default_access_policy.h"
@@ skipping 743 matching lines @@
     if (value.is_null()) {
       window->SetProperty(name, nullptr);
     } else {
       std::vector<uint8_t> data = value.To<std::vector<uint8_t>>();
       window->SetProperty(name, &data);
     }
   }
   client_->OnChangeCompleted(change_id, success);
 }
 
-void WindowTreeImpl::RequestSurface(
+void WindowTreeImpl::AttachSurface(
     Id window_id,
     mojom::SurfaceType type,
     mojo::InterfaceRequest<mojom::Surface> surface,
     mojom::SurfaceClientPtr client) {
   ServerWindow* window = GetWindow(WindowIdFromTransportId(window_id));
   const bool success =
       window && access_policy_->CanSetWindowSurface(window, type);
   if (!success)
     return;
   window->CreateSurface(type, surface.Pass(), client.Pass());
@@ skipping 82 matching lines @@
   return connection && connection != this;
 }
 
 bool WindowTreeImpl::IsDescendantOfEmbedRoot(const ServerWindow* window) {
   return is_embed_root_ && root_ && GetWindow(*root_)->Contains(window);
 }
 
 }  // namespace ws
 
 }  // namespace mus