Add a DevTools warning for a missing subjectAltName

components/security_state/content/content_utils.cc

 // 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 "components/security_state/content/content_utils.h"
 
 #include <string>
 #include <vector>
 
 #include "base/memory/ptr_util.h"
@@ skipping 208 matching lines @@
   }
 
   if (security_info.sha1_in_chain) {
     security_style_explanations->unauthenticated_explanations.push_back(
         content::SecurityStyleExplanation(
             l10n_util::GetStringUTF8(IDS_SHA1),
             l10n_util::GetStringUTF8(IDS_SHA1_DESCRIPTION),
             !!security_info.certificate));
   }
 
+  if (security_info.cert_missing_subject_alt_name) {
+    security_style_explanations->broken_explanations.push_back(
+        content::SecurityStyleExplanation(
+            l10n_util::GetStringUTF8(IDS_SUBJECT_ALT_NAME_MISSING),
+            l10n_util::GetStringUTF8(IDS_SUBJECT_ALT_NAME_MISSING_DESCRIPTION),
+            !!security_info.certificate));
+  }
+
   // Record the presence of mixed content (HTTP subresources on an HTTPS
   // page).
   security_style_explanations->ran_mixed_content =
       security_info.mixed_content_status ==
           security_state::CONTENT_STATUS_RAN ||
       security_info.mixed_content_status ==
           security_state::CONTENT_STATUS_DISPLAYED_AND_RAN;
   security_style_explanations->displayed_mixed_content =
       security_info.mixed_content_status ==
           security_state::CONTENT_STATUS_DISPLAYED ||
@@ skipping 59 matching lines @@
     security_style_explanations->info_explanations.push_back(
         content::SecurityStyleExplanation(
             "Public-Key Pinning Bypassed",
             "Public-key pinning was bypassed by a local root certificate."));
   }
 
   return security_style;
 }
 
 }  // namespace security_state