Chromad: Add authentication flow

chrome/browser/chromeos/login/helper.h

 // Copyright (c) 2012 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.
 //
 // This file contains helper functions used by Chromium OS login.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_HELPER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_HELPER_H_
 
 #include <string>
@@ skipping 90 matching lines @@
 // Returns the storage partition for the sign-in webview. Note the function gets
 // the partition via the sign-in WebContents thus returns nullptr if the sign-in
 // webui is torn down.
 content::StoragePartition* GetSigninPartition();
 
 // Returns the request context that contains sign-in cookies. For old iframe
 // based flow, the context of the sign-in profile is returned. For webview based
 // flow, the context of the sign-in webview storage partition is returned.
 net::URLRequestContextGetter* GetSigninContext();
 
+using OnPipeReadyCallback = base::Callback<void(base::ScopedFD fd)>;
+// Returns file descriptor of a pipe, open for reading. Pipe keeps the passed
+// data.
+void GetPipeReadEnd(const std::string& data,
+                    const OnPipeReadyCallback& callback);
+
 }  // namespace login
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_HELPER_H_