views/mus: Fix showing menu in chrome in mus.

ui/views/mus/window_manager_connection.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 "ui/views/mus/window_manager_connection.h"
 
 #include "base/lazy_instance.h"
 #include "base/threading/thread_local.h"
+#include "base/threading/thread_restrictions.h"
 #include "components/mus/public/cpp/window_tree_connection.h"
 #include "components/mus/public/interfaces/window_tree.mojom.h"
 #include "mojo/application/public/cpp/application_connection.h"
 #include "mojo/application/public/cpp/application_impl.h"
 #include "mojo/converters/geometry/geometry_type_converters.h"
 #include "mojo/converters/network/network_type_converters.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/geometry/point_conversions.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/mojo/init/ui_init.h"
@@ skipping 85 matching lines @@
 }
 
 mus::Window* WindowManagerConnection::NewWindow(
     const std::map<std::string, std::vector<uint8_t>>& properties) {
   mus::mojom::WindowTreeClientPtr window_tree_client;
   mojo::InterfaceRequest<mus::mojom::WindowTreeClient>
       window_tree_client_request = GetProxy(&window_tree_client);
   window_manager_->OpenWindow(
       window_tree_client.Pass(),
       mojo::Map<mojo::String, mojo::Array<uint8_t>>::From(properties));
+
+  base::ThreadRestrictions::ScopedAllowWait allow_wait;
   mus::WindowTreeConnection* window_tree_connection =
       mus::WindowTreeConnection::Create(
           this, window_tree_client_request.Pass(),
           mus::WindowTreeConnection::CreateType::WAIT_FOR_EMBED);
   DCHECK(window_tree_connection->GetRoot());
   return window_tree_connection->GetRoot();
 }
 
 WindowManagerConnection::WindowManagerConnection(mojo::ApplicationImpl* app)
     : app_(app) {
@@ skipping 15 matching lines @@
 NativeWidget* WindowManagerConnection::CreateNativeWidget(
     const Widget::InitParams& init_params,
     internal::NativeWidgetDelegate* delegate) {
   std::map<std::string, std::vector<uint8_t>> properties;
   NativeWidgetMus::ConfigurePropertiesForNewWindow(init_params, &properties);
   return new NativeWidgetMus(delegate, app_->shell(), NewWindow(properties),
                              mus::mojom::SURFACE_TYPE_DEFAULT);
 }
 
 }  // namespace views