[Dice] Parse the Dice response header

components/signin/core/browser/dice_header_helper.h

 // Copyright 2017 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_DICE_HEADER_HELPER_H_
 #define COMPONENTS_SIGNIN_CORE_BROWSER_DICE_HEADER_HELPER_H_
 
 #include <string>
 
 #include "components/signin/core/browser/signin_header_helper.h"
 
 class GURL;
 
 namespace signin {
 
 // SigninHeaderHelper implementation managing the Dice header.
 class DiceHeaderHelper : public SigninHeaderHelper {
  public:
   DiceHeaderHelper() {}
   ~DiceHeaderHelper() override {}
 
+  // Returns the parameters contained in the X-Chrome-ID-Consistency-Response
+  // response header.
+  static DiceResponseParams BuildDiceResponseParams(
+      const std::string& header_value);
+
  private:
   // SigninHeaderHelper implementation:
   bool IsUrlEligibleForRequestHeader(const GURL& url) override;
   std::string BuildRequestHeader(bool is_header_request,
                                  const GURL& url,
                                  const std::string& account_id,
                                  int profile_mode_mask) override;
 };
 
 }  // namespace signin
 
 #endif  // COMPONENTS_SIGNIN_CORE_BROWSER_DICE_HEADER_HELPER_H_