Fetch OAuth2 tokens prior to profile creation.

chrome/browser/chromeos/login/signin/oauth2_token_initializer.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 CHROME_BROWSER_CHROMEOS_LOGIN_SIGNIN_OAUTH2_TOKEN_INITIALIZER_H_
+#define CHROME_BROWSER_CHROMEOS_LOGIN_SIGNIN_OAUTH2_TOKEN_INITIALIZER_H_
+
+#include <string>
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/chromeos/login/signin/oauth2_token_fetcher.h"
+#include "chromeos/login/auth/user_context.h"
+
+namespace chromeos {
+
+// Performs initial fetch of OAuth2 Tokens.
+class OAuth2TokenInitializer final : public OAuth2TokenFetcher::Delegate {
+ public:
+  // Callback to be invoked after initialization is done.
+  using FetchOAuth2TokensCallback =
+      base::Callback<void(bool success, const UserContext& user_context)>;
+
+  OAuth2TokenInitializer();
+  ~OAuth2TokenInitializer() override;
+
+  // Fetch OAuth2 tokens.
+  void Start(const UserContext& context,
+             const FetchOAuth2TokensCallback& callback);
+
+ private:
+  // OAuth2TokenFetcher::Delegate overrides.
+  void OnOAuth2TokensAvailable(
+      const GaiaAuthConsumer::ClientOAuthResult& oauth2_tokens) override;
+  void OnOAuth2TokensFetchFailed() override;
+
+  UserContext user_context_;
+  FetchOAuth2TokensCallback callback_;
+  scoped_ptr<OAuth2TokenFetcher> oauth2_token_fetcher_;
+
+  DISALLOW_COPY_AND_ASSIGN(OAuth2TokenInitializer);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SIGNIN_OAUTH2_TOKEN_INITIALIZER_H_