[ios] Implemented iOS analogue of SSLErrorHandler class.

ios/chrome/browser/ssl/ios_ssl_error_handler.h

+// Copyright 2016 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_CHROME_BROWSER_SSL_IOS_SSL_ERROR_HANDLER_H_
+#define IOS_CHROME_BROWSER_SSL_IOS_SSL_ERROR_HANDLER_H_
+
+#include "base/callback_forward.h"
+#include "url/gurl.h"
+
+namespace net {
+class SSLInfo;
+}  // namespace net
+
+namespace web {
+class WebState;
+}  // namespace web
+
+// This class is responsible for deciding what type of interstitial to show for
+// an SSL validation error.
+class IOSSSLErrorHandler {
+ public:
+  // Entry point for the class.
+  static void HandleSSLError(web::WebState* web_state,
+                             int cert_error,
+                             const net::SSLInfo& info,
+                             const GURL& request_url,
+                             bool overridable,
+                             const base::Callback<void(bool)>& callback);
+
+ private:
+  ~IOSSSLErrorHandler() = delete;
+  // Called on SSL interstitial dismissal.
+  static void InterstitialWasDismissed(
+      web::WebState* web_state,
+      const base::Callback<void(bool)>& callback,
+      bool proceed);
+  DISALLOW_IMPLICIT_CONSTRUCTORS(IOSSSLErrorHandler);
+};
+
+#endif  // IOS_CHROME_BROWSER_SSL_IOS_SSL_ERROR_HANDLER_H_