Have the authenticating_url_loader cache token per-origin.

services/authenticating_url_loader/authenticating_url_loader_impl.h

Index: services/authenticating_url_loader/authenticating_url_loader_impl.h
diff --git a/services/authenticating_url_loader/authenticating_url_loader_impl.h b/services/authenticating_url_loader/authenticating_url_loader_impl.h
index e1e9d030b1355addaa66e3a8812e1458ed80cc12..69c406b23d0e9751d54b6d61bdb7b510d5962fe6 100644
--- a/services/authenticating_url_loader/authenticating_url_loader_impl.h
+++ b/services/authenticating_url_loader/authenticating_url_loader_impl.h
@@ -10,6 +10,7 @@
 #include "mojo/services/authenticating_url_loader/public/interfaces/authenticating_url_loader.mojom.h"
 #include "mojo/services/authentication/public/interfaces/authentication.mojom.h"
 #include "mojo/services/network/public/interfaces/url_loader.mojom.h"
+#include "url/gurl.h"
 
 namespace mojo {
 
@@ -28,6 +29,7 @@ class AuthenticatingURLLoaderImpl : public AuthenticatingURLLoader,
       InterfaceRequest<AuthenticatingURLLoader> request,
       authentication::AuthenticationService* authentication_service,
       NetworkService* network_service,
+      std::map<GURL, std::string>* cached_tokens,
       const Callback<void(AuthenticatingURLLoaderImpl*)>&
           connection_error_callback);
   ~AuthenticatingURLLoaderImpl() override;
@@ -58,13 +60,14 @@ class AuthenticatingURLLoaderImpl : public AuthenticatingURLLoader,
   URLLoaderPtr url_loader_;
   URLResponsePtr pending_response_;
   RequestAuthorizationState request_authorization_state_;
-  String url_;
+  GURL url_;
   bool auto_follow_redirects_;
   bool bypass_cache_;
   Array<String> headers_;
   String username_;
   String token_;
   Callback<void(URLResponsePtr)> pending_start_callback_;
+  std::map<GURL, std::string>* cached_tokens_;
 };
 
 }  // namespace mojo