Makes windowserver not send messages during shutdown

services/ui/ws/window_tree_binding.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 "services/ui/ws/window_tree_binding.h"
 
 #include "base/bind.h"
 #include "services/ui/ws/window_server.h"
 #include "services/ui/ws/window_tree.h"
 
 namespace ui {
 namespace ws {
 
 WindowTreeBinding::WindowTreeBinding(mojom::WindowTreeClient* client)
     : client_(client) {}
 
 WindowTreeBinding::~WindowTreeBinding() {}
 
+void WindowTreeBinding::ResetClientForShutdown() {
+  client_ = CreateClientForShutdown();
+}
+
 DefaultWindowTreeBinding::DefaultWindowTreeBinding(
     WindowTree* tree,
     WindowServer* window_server,
     mojom::WindowTreeRequest service_request,
     mojom::WindowTreeClientPtr client)
     : WindowTreeBinding(client.get()),
       binding_(tree, std::move(service_request)),
       client_(std::move(client)) {
   // Both |window_server| and |tree| outlive us.
   binding_.set_connection_error_handler(
       base::Bind(&WindowServer::DestroyTree, base::Unretained(window_server),
                  base::Unretained(tree)));
 }
 
 DefaultWindowTreeBinding::DefaultWindowTreeBinding(
     WindowTree* tree,
     mojom::WindowTreeClientPtr client)
     : WindowTreeBinding(client.get()),
       binding_(tree),
       client_(std::move(client)) {}
 
 DefaultWindowTreeBinding::~DefaultWindowTreeBinding() {}
 
-void DefaultWindowTreeBinding::SetIncomingMethodCallProcessingPaused(
-    bool paused) {
-  if (paused)
-    binding_.PauseIncomingMethodCallProcessing();
-  else
-    binding_.ResumeIncomingMethodCallProcessing();
-}
-
 mojom::WindowTreePtr DefaultWindowTreeBinding::CreateInterfacePtrAndBind() {
   DCHECK(!binding_.is_bound());
   return binding_.CreateInterfacePtrAndBind();
 }
 
 mojom::WindowManager* DefaultWindowTreeBinding::GetWindowManager() {
   client_->GetWindowManager(
       GetProxy(&window_manager_internal_, client_.associated_group()));
   return window_manager_internal_.get();
 }
 
+void DefaultWindowTreeBinding::SetIncomingMethodCallProcessingPaused(
+    bool paused) {
+  if (paused)
+    binding_.PauseIncomingMethodCallProcessing();
+  else
+    binding_.ResumeIncomingMethodCallProcessing();
+}
+
+mojom::WindowTreeClient* DefaultWindowTreeBinding::CreateClientForShutdown() {
+  client_.reset();
+  GetProxy(&client_);
+  return client_.get();
+}
+
 }  // namespace ws
 }  // namespace ui