[signin] Add DICe flow for account consistency requests.

components/signin/core/browser/signin_header_helper.h

 // Copyright 2013 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 COMPONENTS_SIGNIN_CORE_BROWSER_SIGNIN_HEADER_HELPER_H_
 #define COMPONENTS_SIGNIN_CORE_BROWSER_SIGNIN_HEADER_HELPER_H_
 
 #include <string>
 
 #include "build/build_config.h"  // For OS_IOS
@@ skipping 12 matching lines @@
 
 // Profile mode flags.
 enum ProfileMode {
   PROFILE_MODE_DEFAULT = 0,
   // Incognito mode disabled by enterprise policy or by parental controls.
   PROFILE_MODE_INCOGNITO_DISABLED = 1 << 0,
   // Adding account disabled in the Android-for-EDU mode.
   PROFILE_MODE_ADD_ACCOUNT_DISABLED = 1 << 1
 };
 
 extern const char kChromeConnectedHeader[];

[msarda, 2017/06/07 13:06:30]

 I think these headers are public only for test.
I find Identity Consistency and Account Consistency are very confusing.

What do you think about renaming them to kMirrorRequestHeader and
kDiceRequestHeader?

[droger, 2017/06/07 13:29:57]

Yes, that's fine.

[msarda, 2017/06/08 02:53:38]

After today's discussion ,let's keep the current name kChromeConnectedHeader.

+extern const char kChromeIDConsistencyRequestHeader[];
 
 // The ServiceType specified by GAIA in the response header accompanying the 204
 // response. This indicates the action Chrome is supposed to lead the user to
 // perform.
 enum GAIAServiceType {
   GAIA_SERVICE_TYPE_NONE = 0,    // No GAIA response header.
   GAIA_SERVICE_TYPE_SIGNOUT,     // Logout all existing sessions.
   GAIA_SERVICE_TYPE_INCOGNITO,   // Open an incognito tab.
   GAIA_SERVICE_TYPE_ADDSESSION,  // Add a secondary account.
   GAIA_SERVICE_TYPE_REAUTH,      // Re-authenticate an account.
@@ skipping 56 matching lines @@
 // Returns the parameters contained in the X-Chrome-Manage-Accounts response
 // header.
 // If the request does not have a response header or if the header contains
 // garbage, then |service_type| is set to |GAIA_SERVICE_TYPE_NONE|.
 ManageAccountsParams BuildManageAccountsParamsIfExists(net::URLRequest* request,
                                                        bool is_off_the_record);
 
 }  // namespace signin
 
 #endif  // COMPONENTS_SIGNIN_CORE_BROWSER_SIGNIN_HEADER_HELPER_H_