mus: Introduce AttachSurface to allow creating Surface prior to OnEmbed

components/mus/public/cpp/lib/window_tree_client_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/public/cpp/lib/window_tree_client_impl.h"
 
 #include "base/bind.h"
 #include "components/mus/common/util.h"
 #include "components/mus/public/cpp/lib/in_flight_change.h"
 #include "components/mus/public/cpp/lib/window_private.h"
@@ skipping 245 matching lines @@
 
 void WindowTreeClientImpl::Embed(
     Id window_id,
     mojom::WindowTreeClientPtr client,
     uint32_t policy_bitmask,
     const mojom::WindowTree::EmbedCallback& callback) {
   DCHECK(tree_);
   tree_->Embed(window_id, client.Pass(), policy_bitmask, callback);
 }
 
-void WindowTreeClientImpl::RequestSurface(
+void WindowTreeClientImpl::AttachToSurface(
     Id window_id,
     mojom::SurfaceType type,
     mojo::InterfaceRequest<mojom::Surface> surface,
     mojom::SurfaceClientPtr client) {
   DCHECK(tree_);
-  tree_->RequestSurface(window_id, type, surface.Pass(), client.Pass());
+  tree_->AttachToSurface(window_id, type, surface.Pass(), client.Pass());
 }
 
 void WindowTreeClientImpl::AddWindow(Window* window) {
   DCHECK(windows_.find(window->id()) == windows_.end());
   windows_[window->id()] = window;
 }
 
 void WindowTreeClientImpl::RemoveWindow(Id window_id) {
   if (focused_window_ && focused_window_->id() == window_id)
     OnWindowFocused(0);
@@ skipping 374 matching lines @@
 void WindowTreeClientImpl::OnActionCompleted(bool success) {
   if (!change_acked_callback_.is_null())
     change_acked_callback_.Run();
 }
 
 mojo::Callback<void(bool)> WindowTreeClientImpl::ActionCompletedCallback() {
   return [this](bool success) { OnActionCompleted(success); };
 }
 
 }  // namespace mus