View synchronization

mojo/services/public/cpp/view_manager/lib/view_manager_private.cc

Index: mojo/services/public/cpp/view_manager/lib/view_manager_private.cc
diff --git a/mojo/services/public/cpp/view_manager/lib/view_manager_private.cc b/mojo/services/public/cpp/view_manager/lib/view_manager_private.cc
index bf08b396e0fe4bde4ad4556e516ca139b67980f8..d69a383604aac321d5eed6a71b6c4533c5d2eab7 100644
--- a/mojo/services/public/cpp/view_manager/lib/view_manager_private.cc
+++ b/mojo/services/public/cpp/view_manager/lib/view_manager_private.cc
@@ -13,6 +13,7 @@ ViewManagerPrivate::ViewManagerPrivate(ViewManager* manager)
 ViewManagerPrivate::~ViewManagerPrivate() {}
 
 void ViewManagerPrivate::AddNode(TransportNodeId node_id, ViewTreeNode* node) {
+  DCHECK(!manager_->nodes_[node_id]);
   manager_->nodes_[node_id] = node;
 }
 
@@ -22,6 +23,17 @@ void ViewManagerPrivate::RemoveNode(TransportNodeId node_id) {
     manager_->nodes_.erase(it);
 }
 
+void ViewManagerPrivate::AddView(TransportViewId view_id, View* view) {
+  DCHECK(!manager_->views_[view_id]);
+  manager_->views_[view_id] = view;
+}
+
+void ViewManagerPrivate::RemoveView(TransportViewId view_id) {
+  ViewManager::IdToViewMap::iterator it = manager_->views_.find(view_id);
+  if (it != manager_->views_.end())
+    manager_->views_.erase(it);
+}
+
 }  // namespace view_manager
 }  // namespace services
 }  // namespace mojo