Have the authenticating_url_loader cache token per-origin.

services/authenticating_url_loader/authenticating_url_loader_factory_impl.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 SERVICES_AUTHENTICATING_URL_LOADER_AUTHENTICATING_URL_LOADER_FACTORY_IMPL_H_
 #define SERVICES_AUTHENTICATING_URL_LOADER_AUTHENTICATING_URL_LOADER_FACTORY_IMPL_H_
 
 #include <memory>
 
 #include "mojo/public/cpp/bindings/error_handler.h"
 #include "mojo/public/cpp/bindings/interface_request.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 #include "mojo/services/authenticating_url_loader/public/interfaces/authenticating_url_loader_factory.mojom.h"
 #include "mojo/services/authentication/public/interfaces/authentication.mojom.h"
 #include "mojo/services/network/public/interfaces/network_service.mojom.h"
+#include "url/gurl.h"
 
 namespace mojo {
 
 class ApplicationImpl;
 
 class AuthenticatingURLLoaderImpl;
 
 class AuthenticatingURLLoaderFactoryImpl
     : public AuthenticatingURLLoaderFactory,
       public ErrorHandler {
@@ skipping 13 matching lines @@
   // ErrorHandler:
   void OnConnectionError() override;
 
   void DeleteURLLoader(AuthenticatingURLLoaderImpl* url_loader);
 
   StrongBinding<AuthenticatingURLLoaderFactory> binding_;
   ApplicationImpl* app_;
   authentication::AuthenticationServicePtr authentication_service_;
   NetworkServicePtr network_service_;
   std::vector<std::unique_ptr<AuthenticatingURLLoaderImpl>> url_loaders_;
+  std::map<GURL, std::string> cached_tokens_;
 };
 
 }  // namespace mojo
 
 #endif  // SERVICES_AUTHENTICATING_URL_LOADER_AUTHENTICATING_URL_LOADER_FACTORY_IMPL_H_