Pass embedding app identity through at embed time

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

Index: mojo/services/public/cpp/view_manager/lib/view_manager_synchronizer.cc
diff --git a/mojo/services/public/cpp/view_manager/lib/view_manager_synchronizer.cc b/mojo/services/public/cpp/view_manager/lib/view_manager_synchronizer.cc
index 555673d28bb36da38c937b3084e5cd798d8a884a..5b8e8bb77068c5b9d0f7132125d010ca64c07b6f 100644
--- a/mojo/services/public/cpp/view_manager/lib/view_manager_synchronizer.cc
+++ b/mojo/services/public/cpp/view_manager/lib/view_manager_synchronizer.cc
@@ -597,6 +597,10 @@ void ViewManagerSynchronizer::RemoveView(Id view_id) {
 ////////////////////////////////////////////////////////////////////////////////
 // ViewManagerSynchronizer, ViewManager implementation:
 
+const std::string& ViewManagerSynchronizer::GetEmbedderURL() const {
+  return creator_url_;
+}
+
 const std::vector<ViewTreeNode*>& ViewManagerSynchronizer::GetRoots() const {
   return roots_;
 }
@@ -623,10 +627,12 @@ void ViewManagerSynchronizer::OnConnectionEstablished() {
 
 void ViewManagerSynchronizer::OnViewManagerConnectionEstablished(
     ConnectionSpecificId connection_id,
+    const String& creator_url,
     Id next_server_change_id,
-    mojo::Array<INodePtr> nodes) {
+    Array<INodePtr> nodes) {
   connected_ = true;
   connection_id_ = connection_id;
+  creator_url_ = TypeConverter<String, std::string>::ConvertFrom(creator_url);
   next_server_change_id_ = next_server_change_id;
 
   DCHECK(pending_transactions_.empty());