[ios] Implemented iOS analogue of SSLErrorHandler class.

ios/chrome/browser/ssl/ios_ssl_error_handler.mm

+// 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.
+
+#include "ios/chrome/browser/ssl/ios_ssl_error_handler.h"
+
+#include "base/bind.h"
+#include "base/callback.h"
+#include "components/security_interstitials/core/ssl_error_ui.h"
+#include "ios/chrome/browser/ssl/ios_ssl_blocking_page.h"
+#import "ios/web/public/navigation_manager.h"
+#import "ios/web/public/web_state/web_state.h"
+#include "net/ssl/ssl_info.h"
+
+// static
+void IOSSSLErrorHandler::HandleSSLError(
+    web::WebState* web_state,
+    int cert_error,
+    const net::SSLInfo& info,
+    const GURL& request_url,
+    bool overridable,
+    const base::Callback<void(bool)>& callback) {
+  DCHECK(!web_state->IsShowingWebInterstitial());
+
+  int options_mask =
+      overridable ? security_interstitials::SSLErrorUI::SOFT_OVERRIDE_ENABLED
+                  : security_interstitials::SSLErrorUI::STRICT_ENFORCEMENT;
+  // SSLBlockingPage deletes itself when it's dismissed.
+  auto dismissal_callback(
+      base::Bind(&IOSSSLErrorHandler::InterstitialWasDismissed,
+                 base::Unretained(web_state), callback));
+  IOSSSLBlockingPage* page = new IOSSSLBlockingPage(
+      web_state, cert_error, info, request_url, options_mask,
+      base::Time::NowFromSystemTime(), dismissal_callback);
+  page->Show();
+}
+
+// static
+void IOSSSLErrorHandler::InterstitialWasDismissed(
+    web::WebState* web_state,
+    const base::Callback<void(bool)>& callback,
+    bool proceed) {
+  if (!proceed) {
+    web_state->GetNavigationManager()->Reload(true /* check_for_repost */);
+  }
+  callback.Run(proceed);
+}