Add code to mint OAuth tokens from login-scoped OAuth token.

chrome/common/net/gaia/oauth2_token_mint_consumer.h

Index: chrome/common/net/gaia/oauth2_token_mint_consumer.h
===================================================================
--- chrome/common/net/gaia/oauth2_token_mint_consumer.h	(revision 0)
+++ chrome/common/net/gaia/oauth2_token_mint_consumer.h	(revision 0)
@@ -0,0 +1,23 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.

[asargent_no_longer_on_chrome, 2012/03/01 00:53:36]

nit: 2012  =)

(here and some of the other files you added)

[Munjal (Google), 2012/03/01 18:38:52]

Done.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_COMMON_NET_GAIA_OAUTH2_TOKEN_MINT_CONSUMER_H_
+#define CHROME_COMMON_NET_GAIA_OAUTH2_TOKEN_MINT_CONSUMER_H_
+#pragma once
+
+#include <string>
+
+class GoogleServiceAuthError;
+
+// An interface that defines the callbacks for consumers to which
+// OAuth2TokenMintFetcher can return results.
+class OAuth2TokenMintConsumer {
+ public:
+  virtual ~OAuth2TokenMintConsumer() {}
+
+  virtual void OnMintTokenSuccess(const std::string& access_token) {}
+  virtual void OnMintTokenFailure(const GoogleServiceAuthError& error) {}
+};
+
+#endif  // CHROME_COMMON_NET_GAIA_OAUTH2_TOKEN_MINT_CONSUMER_H_