Pass embedding app identity through at embed time

mojo/examples/aura_demo/aura_demo.cc

Index: mojo/examples/aura_demo/aura_demo.cc
diff --git a/mojo/examples/aura_demo/aura_demo.cc b/mojo/examples/aura_demo/aura_demo.cc
index d40a1ce67f86c06bfca24925191696565affc1b5..fd87f69b600b28975530d61189dc1c123067c5f2 100644
--- a/mojo/examples/aura_demo/aura_demo.cc
+++ b/mojo/examples/aura_demo/aura_demo.cc
@@ -148,6 +148,7 @@ class IViewManagerClientImpl
   // IViewManagerClient:
   virtual void OnViewManagerConnectionEstablished(
       uint16_t connection_id,
+      const String& creator_url,
       uint32_t next_server_change_id,
       mojo::Array<view_manager::INodePtr> nodes) OVERRIDE;
   virtual void OnRootsAdded(Array<view_manager::INodePtr> nodes) OVERRIDE {
@@ -288,6 +289,7 @@ class AuraDemo : public Application, public WindowTreeHostMojoDelegate {
 
 void IViewManagerClientImpl::OnViewManagerConnectionEstablished(
       uint16_t connection_id,
+      const String& creator_url,
       uint32_t next_server_change_id,
       mojo::Array<view_manager::INodePtr> nodes) {
   const uint32_t view_id = connection_id << 16 | 1;