Provide an API to the example window manager app that supports closing a window.

mojo/services/public/cpp/view_manager/lib/view_manager.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 "mojo/services/public/cpp/view_manager/view_manager.h"
 
 #include "base/bind.h"
 #include "base/run_loop.h"
 #include "mojo/public/cpp/application/application.h"
 #include "mojo/services/public/cpp/view_manager/lib/view_manager_private.h"
 #include "mojo/services/public/cpp/view_manager/lib/view_manager_synchronizer.h"
 #include "mojo/services/public/cpp/view_manager/lib/view_tree_node_private.h"
 #include "mojo/services/public/cpp/view_manager/view.h"
 
 namespace mojo {
 namespace view_manager {
 namespace {
 
-void OnViewManagerReady(base::RunLoop* loop, ViewManager* manager) {
+void OnViewManagerReady(base::RunLoop* loop,
+                        ViewManager* manager,
+                        ViewTreeNode* root) {
   loop->Quit();
 }
 
 }  // namespace
 
 ////////////////////////////////////////////////////////////////////////////////
 // ViewManager, public:
 
 ViewManager::~ViewManager() {
   while (!nodes_.empty()) {
     IdToNodeMap::iterator it = nodes_.begin();
     if (synchronizer_->OwnsNode(it->second->id()))
       it->second->Destroy();
     else
       nodes_.erase(it);
   }
   while (!views_.empty()) {
     IdToViewMap::iterator it = views_.begin();
     if (synchronizer_->OwnsView(it->second->id()))
       it->second->Destroy();
     else
       views_.erase(it);
   }
 }
 
 // static
-ViewManager* ViewManager::CreateBlocking(
-    Application* application,
-    const base::Callback<void(ViewManager*)>& root_added_callback) {
+ViewManager* ViewManager::CreateBlocking(Application* application) {
   base::RunLoop init_loop;
   ViewManager* manager = new ViewManager(
       application,
-      base::Bind(&OnViewManagerReady, &init_loop));
+      base::Bind(&OnViewManagerReady, &init_loop),
+      RootCallback());
   init_loop.Run();
   return manager;
 }
 
 // static
 void ViewManager::Create(
     Application* application,
-    const base::Callback<void(ViewManager*)>& root_added_callback) {
-  new ViewManager(application, root_added_callback);
+    const RootCallback& root_added_callback,
+    const RootCallback& root_removed_callback) {
+  new ViewManager(application, root_added_callback, root_removed_callback);
 }
 
 ViewTreeNode* ViewManager::GetNodeById(TransportNodeId id) {
   IdToNodeMap::const_iterator it = nodes_.find(id);
   return it != nodes_.end() ? it->second : NULL;
 }
 
 View* ViewManager::GetViewById(TransportViewId id) {
   IdToViewMap::const_iterator it = views_.find(id);
   return it != views_.end() ? it->second : NULL;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // ViewManager, private:
 
 ViewManager::ViewManager(
     Application* application,
-    const base::Callback<void(ViewManager*)>& root_added_callback)
+    const RootCallback& root_added_callback,
+    const RootCallback& root_removed_callback)
     : root_added_callback_(root_added_callback),
+      root_removed_callback_(root_removed_callback),
       synchronizer_(NULL) {
   application->AddService<ViewManagerSynchronizer>(this);
 }
 
 }  // namespace view_manager
 }  // namespace mojo