Add a instance groups to Connect(), and introduce an Identity struct.

components/resource_provider/resource_provider_app.h

Index: components/resource_provider/resource_provider_app.h
diff --git a/components/resource_provider/resource_provider_app.h b/components/resource_provider/resource_provider_app.h
index 14b867ab618bcc6318e73e9ff86aace927182e44..10f7602c2dd949dc68c57984cf44a4574e09ba6e 100644
--- a/components/resource_provider/resource_provider_app.h
+++ b/components/resource_provider/resource_provider_app.h
@@ -25,8 +25,8 @@ class ResourceProviderApp : public mojo::ShellClient,
 
  private:
   // mojo::ShellClient:
-  void Initialize(mojo::Connector* connector, const std::string& url,
-                  const std::string& user_id, uint32_t id) override;
+  void Initialize(mojo::Connector* connector, const mojo::Identity& identity,
+                  uint32_t id) override;
   bool AcceptConnection(mojo::Connection* connection) override;
 
   // mojo::InterfaceFactory<ResourceProvider>: