Makes it so a node can only the root of one connection at a time

mojo/services/view_manager/root_node_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/view_manager/root_node_manager.h"
 
 #include "base/logging.h"
 #include "mojo/public/cpp/application/application_connection.h"
 #include "mojo/public/interfaces/service_provider/service_provider.mojom.h"
 #include "mojo/services/public/cpp/input_events/input_events_type_converters.h"
@@ skipping 15 matching lines @@
       connection_id_(connection->id()),
       change_type_(change_type),
       is_delete_node_(is_delete_node) {
   root_->PrepareForChange(this);
 }
 
 RootNodeManager::ScopedChange::~ScopedChange() {
   root_->FinishChange();
 }
 
+void RootNodeManager::ScopedChange::SendServerChangeIdAdvanced() {
+  root_->SendServerChangeIdAdvanced();
+}
+
 RootNodeManager::Context::Context() {
   // Pass in false as native viewport creates the PlatformEventSource.
   aura::Env::CreateInstance(false);
 }
 
 RootNodeManager::Context::~Context() {
   aura::Env::DeleteInstance();
 }
 
 RootNodeManager::RootNodeManager(
@@ skipping 88 matching lines @@
     ConnectionSpecificId creator_id,
     const std::string& url) const {
   for (ConnectionMap::const_iterator i = connection_map_.begin();
        i != connection_map_.end(); ++i) {
     if (i->second->creator_id() == creator_id && i->second->url() == url)
       return i->second;
   }
   return NULL;
 }
 
+ViewManagerServiceImpl* RootNodeManager::GetConnectionWithRoot(
+    const NodeId& id) {
+  for (ConnectionMap::const_iterator i = connection_map_.begin();
+       i != connection_map_.end(); ++i) {
+    if (i->second->HasRoot(id))
+      return i->second;
+  }
+  return NULL;
+}
+
 void RootNodeManager::DispatchViewInputEventToWindowManager(
     const View* view,
     const ui::Event* event) {
   // Input events are forwarded to the WindowManager. The WindowManager
   // eventually calls back to us with DispatchOnViewInputEvent().
   ViewManagerServiceImpl* connection = GetConnection(kWindowManagerConnection);
   if (!connection)
     return;
   connection->client()->DispatchOnViewInputEvent(
       ViewIdToTransportId(view->id()),
@@ skipping 75 matching lines @@
 }
 
 void RootNodeManager::FinishChange() {
   // PrepareForChange/FinishChange should be balanced.
   CHECK(current_change_);
   if (current_change_->change_type() == CHANGE_TYPE_ADVANCE_SERVER_CHANGE_ID)
     next_server_change_id_++;
   current_change_ = NULL;
 }
 
+void RootNodeManager::SendServerChangeIdAdvanced() {
+  CHECK(current_change_);
+  for (ConnectionMap::iterator i = connection_map_.begin();
+       i != connection_map_.end(); ++i) {
+    if (!DidConnectionMessageClient(i->first))
+      i->second->client()->OnServerChangeIdAdvanced(next_server_change_id_ + 1);
+  }
+}
+
 ViewManagerServiceImpl* RootNodeManager::EmbedImpl(
     const ConnectionSpecificId creator_id,
     const String& url,
     const NodeId& root_id) {
   MessagePipe pipe;
 
   ServiceProvider* service_provider =
       app_connection_->ConnectToApplication(url)->GetServiceProvider();
   service_provider->ConnectToService(
       ViewManagerServiceImpl::Client::Name_,
       pipe.handle1.Pass());
 
   std::string creator_url;
   ConnectionMap::const_iterator it = connection_map_.find(creator_id);
   if (it != connection_map_.end())
     creator_url = it->second->url();
 
   ViewManagerServiceImpl* connection =
       new ViewManagerServiceImpl(this,
                                  creator_id,
                                  creator_url,
                                  url.To<std::string>(),
                                  root_id);
   BindToPipe(connection, pipe.handle0.Pass());
   connections_created_by_connect_.insert(connection);
+  OnConnectionMessagedClient(connection->id());
   return connection;
 }
 
 void RootNodeManager::OnNodeDestroyed(const Node* node) {
   ProcessNodeDeleted(node->id());
 }
 
 void RootNodeManager::OnNodeHierarchyChanged(const Node* node,
                                              const Node* new_parent,
                                              const Node* old_parent) {
@@ skipping 14 matching lines @@
 }
 
 void RootNodeManager::OnViewInputEvent(const View* view,
                                        const ui::Event* event) {
   DispatchViewInputEventToWindowManager(view, event);
 }
 
 }  // namespace service
 }  // namespace view_manager
 }  // namespace mojo