WKWebView(iOS9): correctly update SSL status for current navigation item

ios/web/public/ssl_status.h

 // Copyright 2014 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 IOS_WEB_PUBLIC_SSL_STATUS_H_
 #define IOS_WEB_PUBLIC_SSL_STATUS_H_
 
+#include <string>
+
 #include "ios/web/public/security_style.h"
 #include "net/cert/cert_status_flags.h"
 
 namespace web {
 
 // Collects the SSL information for this NavigationItem.
 struct SSLStatus {
   // Flags used for the page security content status.
   enum ContentStatusFlags {
     // HTTP page, or HTTPS page with no insecure content.
     NORMAL_CONTENT             = 0,
 
     // HTTPS page containing "displayed" HTTP resources (e.g. images, CSS).
     DISPLAYED_INSECURE_CONTENT = 1 << 0,
 
     // The RAN_INSECURE_CONTENT flag is intentionally omitted on iOS because
     // there is no way to tell when insecure content is run in a web view.
   };
 
   SSLStatus();
   ~SSLStatus();
 
   bool Equals(const SSLStatus& status) const {
     return security_style == status.security_style &&
            cert_id == status.cert_id &&
            cert_status == status.cert_status &&
            security_bits == status.security_bits &&
            content_status == status.content_status;
+           // |cert_status_host| is not used for comparison intentionally.
   }
 
   web::SecurityStyle security_style;
   int cert_id;
   net::CertStatus cert_status;
   int security_bits;
   int connection_status;
   // A combination of the ContentStatusFlags above.
   int content_status;
+  // Host which was used for |cert_status| calculation. It is not an actual part
+  // of SSL status, hence it's not taken into account in |Equals| method.
+  // Used to check if |cert_status| is still valid or needs to be recalculated
+  // (e.g. after redirect).
+  std::string cert_status_host;
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_PUBLIC_SSL_STATUS_H_