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

content/browser/frame_host/frame_mojo_shell.h

 // Copyright 2015 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.
 
 #ifndef CONTENT_BROWSER_FRAME_HOST_FRAME_MOJO_SHELL_H_
 #define CONTENT_BROWSER_FRAME_HOST_FRAME_MOJO_SHELL_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
@@ skipping 11 matching lines @@
 class FrameMojoShell : public mojo::shell::mojom::Connector {
  public:
   explicit FrameMojoShell(RenderFrameHost* frame_host);
   ~FrameMojoShell() override;
 
   void BindRequest(mojo::shell::mojom::ConnectorRequest request);
 
  private:
   // mojo::Connector:
   void Connect(
-      const mojo::String& application_name,
-      const mojo::String& user_id,
+      mojo::shell::mojom::IdentityPtr target,
       mojo::shell::mojom::InterfaceProviderRequest services,
       mojo::shell::mojom::InterfaceProviderPtr exposed_services,
       const mojo::shell::mojom::Connector::ConnectCallback& callback) override;
   void Clone(mojo::shell::mojom::ConnectorRequest request) override;
 
   ServiceRegistryImpl* GetServiceRegistry();
 
   RenderFrameHost* frame_host_;
   mojo::BindingSet<mojo::shell::mojom::Connector> connectors_;
 
   // ServiceRegistry providing browser services to connected applications.
   scoped_ptr<ServiceRegistryImpl> service_registry_;
   mojo::BindingSet<mojo::shell::mojom::InterfaceProvider>
       service_provider_bindings_;
 
   DISALLOW_COPY_AND_ASSIGN(FrameMojoShell);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_FRAME_MOJO_SHELL_H_