Account for server vs host clock skew in cookie expiration times.

net/cookies/cookie_options.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.
 
 // Brought to you by number 42.
 
 #ifndef NET_COOKIES_COOKIE_OPTIONS_H_
 #define NET_COOKIES_COOKIE_OPTIONS_H_
 
 namespace net {
 
 class CookieOptions {
  public:
   // Default is to exclude httponly, which means:
   // - reading operations will not return httponly cookies.
   // - writing operations will not write httponly cookies.
   CookieOptions()
-      : exclude_httponly_(true) {
+      : exclude_httponly_(true),
+        server_time_() {
   }
 
   void set_exclude_httponly() { exclude_httponly_ = true; }
   void set_include_httponly() { exclude_httponly_ = false; }
   bool exclude_httponly() const { return exclude_httponly_; }
 
+  // |server_time| indicates what the server sending us the Cookie thought the
+  // current time was when the cookie was produced.  This is used to adjust for
+  // clock skew between server and host.
+  void set_server_time(const base::Time& server_time) {
+    server_time_ = server_time;
+  }
+  bool has_server_time() const { return !server_time_.is_null(); }
+  base::Time server_time() const { return server_time_; }
+
  private:
   bool exclude_httponly_;
+  base::Time server_time_;
 };
 }  // namespace net
 
 #endif  // NET_COOKIES_COOKIE_OPTIONS_H_