Removes WebContentsViewMus/RenderWidgetHostViewMus

ui/aura/mus/window_tree_client.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 "ui/aura/mus/window_tree_client.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <utility>
@@ skipping 246 matching lines @@
   DCHECK(tree_);
   tree_->SetImeVisibility(window->server_id(), visible, std::move(state));
 }
 
 void WindowTreeClient::Embed(
     Window* window,
     ui::mojom::WindowTreeClientPtr client,
     uint32_t flags,
     const ui::mojom::WindowTree::EmbedCallback& callback) {
   DCHECK(tree_);
+  // Window::Init() must be called before Embed() (otherwise the server hasn't
+  // been told about the window).
+  DCHECK(window->layer());
   if (!window->children().empty()) {
     // The window server removes all children before embedding. In other words,
     // it's generally an error to Embed() with existing children. So, fail
     // early.
     callback.Run(false);
     return;
   }
 
   tree_->Embed(WindowMus::Get(window)->server_id(), std::move(client), flags,
                callback);
@@ skipping 1410 matching lines @@
   return ScheduleInFlightChange(base::MakeUnique<InFlightCaptureChange>(
       this, capture_synchronizer_.get(), window));
 }
 
 uint32_t WindowTreeClient::CreateChangeIdForFocus(WindowMus* window) {
   return ScheduleInFlightChange(base::MakeUnique<InFlightFocusChange>(
       this, focus_synchronizer_.get(), window));
 }
 
 }  // namespace aura