Have the authenticating_url_loader cache token per-origin.

services/authenticating_url_loader/authenticating_url_loader_factory_impl.cc

 // 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.
 
 #include "services/authenticating_url_loader/authenticating_url_loader_factory_impl.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "mojo/public/cpp/application/application_impl.h"
@@ skipping 22 matching lines @@
     url_loader->SetAuthenticationService(authentication_service_.get());
   }
 }
 
 void AuthenticatingURLLoaderFactoryImpl::CreateAuthenticatingURLLoader(
     mojo::InterfaceRequest<AuthenticatingURLLoader> loader_request) {
   url_loaders_.push_back(std::unique_ptr<AuthenticatingURLLoaderImpl>(
       new AuthenticatingURLLoaderImpl(
           loader_request.Pass(), authentication_service_.get(),
           network_service_.get(),
+          &cached_tokens_,
           base::Bind(&AuthenticatingURLLoaderFactoryImpl::DeleteURLLoader,
                      base::Unretained(this)))));
 }
 
 void AuthenticatingURLLoaderFactoryImpl::OnConnectionError() {
   SetAuthenticationService(nullptr);
 }
 
 void AuthenticatingURLLoaderFactoryImpl::DeleteURLLoader(
     AuthenticatingURLLoaderImpl* url_loader) {
   auto it = std::find_if(
       url_loaders_.begin(), url_loaders_.end(),
       [url_loader](const std::unique_ptr<AuthenticatingURLLoaderImpl>& p) {
         return p.get() == url_loader;
       });
   DCHECK(it != url_loaders_.end());
   url_loaders_.erase(it);
 }
 
 }  // namespace mojo