Add a SetCanonicalCookie method for CookieMonster.

net/cookies/canonical_cookie.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.
 
 #ifndef NET_COOKIES_CANONICAL_COOKIE_H_
 #define NET_COOKIES_CANONICAL_COOKIE_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 29 matching lines @@
                   bool secure,
                   bool httponly,
                   CookieSameSite same_site,
                   CookiePriority priority);
 
   ~CanonicalCookie();
 
   // Supports the default copy constructor.
 
   // Creates a new |CanonicalCookie| from the |cookie_line| and the
-  // |creation_time|. Canonicalizes and validates inputs. May return NULL if
-  // an attribute value is invalid.
+  // |creation_time|.  Canonicalizes and validates inputs. May return NULL if
+  // an attribute value is invalid.  |creation_time| may not be null.
   static std::unique_ptr<CanonicalCookie> Create(
       const GURL& url,
       const std::string& cookie_line,
       const base::Time& creation_time,
       const CookieOptions& options);
 
   const std::string& Name() const { return name_; }
   const std::string& Value() const { return value_; }
   const std::string& Domain() const { return domain_; }
   const std::string& Path() const { return path_; }
@@ skipping 90 matching lines @@
   //   that the creation time is null, or
   // * It can be derived from a cookie created by CanonicalCookie::Create by
   //   entry into and retrieval from a cookie store (specifically, this means
   //   by the setting of an creation time in place of a null creation time, and
   //   the setting of a last access time).
   // An additional requirement on a CanonicalCookie is that if the last
   // access time is non-null, the creation time must also be non-null and
   // greater than the last access time.
   bool IsCanonical() const;
 
+  // Sets the creation date of the cookie to the specified value.  It
+  // is only valid to call this method if the existing creation date
+  // is null.
+  void SetCreationDate(base::Time new_creation_date);
+
  private:
   FRIEND_TEST_ALL_PREFIXES(CanonicalCookieTest, TestPrefixHistograms);
 
   // The special cookie prefixes as defined in
   // https://tools.ietf.org/html/draft-west-cookie-prefixes
   //
   // This enum is being histogrammed; do not reorder or remove values.
   enum CookiePrefix {
     COOKIE_PREFIX_NONE = 0,
     COOKIE_PREFIX_SECURE,
@@ skipping 28 matching lines @@
   bool httponly_;
   CookieSameSite same_site_;
   CookiePriority priority_;
 };
 
 typedef std::vector<CanonicalCookie> CookieList;
 
 }  // namespace net
 
 #endif  // NET_COOKIES_CANONICAL_COOKIE_H_