mus: Fix creating the factory for window-tree-client in renderer.

content/renderer/mus/render_widget_window_tree_client_factory.cc

 // Copyright 2015 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 "content/renderer/mus/render_widget_window_tree_client_factory.h"
 
 #include <stdint.h>
 
 #include "base/logging.h"
 #include "base/macros.h"
@@ skipping 13 matching lines @@
 #include "services/ui/public/interfaces/window_tree.mojom.h"
 #include "url/gurl.h"
 
 namespace content {
 
 namespace {
 
 void BindMusConnectionOnMainThread(
     uint32_t routing_id,
     ui::mojom::WindowTreeClientRequest request) {
+  RendererWindowTreeClient::CreateIfNecessary(routing_id);
   RendererWindowTreeClient::Get(routing_id)->Bind(std::move(request));
 }
 
 // This object's lifetime is managed by ServiceManagerConnection because it's a
 // registered with it.
 class RenderWidgetWindowTreeClientFactoryImpl
     : public ConnectionFilter,
       public mojom::RenderWidgetWindowTreeClientFactory {
  public:
   RenderWidgetWindowTreeClientFactoryImpl() : weak_factory_(this) {
@@ skipping 36 matching lines @@
 
 }  // namespace
 
 void CreateRenderWidgetWindowTreeClientFactory(
     ServiceManagerConnection* connection) {
   connection->AddConnectionFilter(
       base::MakeUnique<RenderWidgetWindowTreeClientFactoryImpl>());
 }
 
 }  // namespace content